diff --git a/lib/event_processor/batch_event_processor.ts b/lib/event_processor/batch_event_processor.ts
index 40282a8f3..baf7a2d86 100644
--- a/lib/event_processor/batch_event_processor.ts
+++ b/lib/event_processor/batch_event_processor.ts
@@ -27,8 +27,10 @@ import { isSuccessStatusCode } from "../utils/http_request_handler/http_util";
 import { EventEmitter } from "../utils/event_emitter/event_emitter";
 import { IdGenerator } from "../utils/id_generator";
 import { areEventContextsEqual } from "./event_builder/user_event";
-import { EVENT_PROCESSOR_STOPPED, FAILED_TO_DISPATCH_EVENTS, FAILED_TO_DISPATCH_EVENTS_WITH_ARG } from "error_message";
+import { FAILED_TO_DISPATCH_EVENTS, SERVICE_NOT_RUNNING } from "error_message";
 import { OptimizelyError } from "../error/optimizly_error";
+import { sprintf } from "../utils/fns";
+import { SERVICE_STOPPED_BEFORE_RUNNING } from "../service";
 
 export const DEFAULT_MIN_BACKOFF = 1000;
 export const DEFAULT_MAX_BACKOFF = 32000;
@@ -174,7 +176,7 @@ export class BatchEventProcessor extends BaseService implements EventProcessor {
     const dispatcher = closing && this.closingEventDispatcher ? this.closingEventDispatcher : this.eventDispatcher;
     return dispatcher.dispatchEvent(request).then((res) => {
       if (res.statusCode && !isSuccessStatusCode(res.statusCode)) {
-        return Promise.reject(new OptimizelyError(FAILED_TO_DISPATCH_EVENTS_WITH_ARG, res.statusCode));
+        return Promise.reject(new OptimizelyError(FAILED_TO_DISPATCH_EVENTS, res.statusCode));
       }
       return Promise.resolve(res);
     });
@@ -209,7 +211,7 @@ export class BatchEventProcessor extends BaseService implements EventProcessor {
     }).catch((err) => {
       // if the dispatch fails, the events will still be
       // in the store for future processing
-      this.logger?.error(FAILED_TO_DISPATCH_EVENTS, err);
+      this.logger?.error(err);
     }).finally(() => {
       this.runningTask.delete(taskId);
       ids.forEach((id) => this.dispatchingEventIds.delete(id));
@@ -228,7 +230,7 @@ export class BatchEventProcessor extends BaseService implements EventProcessor {
 
   async process(event: ProcessableEvent): Promise<void> {
     if (!this.isRunning()) {
-      return Promise.reject('Event processor is not running');
+      return Promise.reject(new OptimizelyError(SERVICE_NOT_RUNNING, 'BatchEventProcessor'));
     }
 
     const eventWithId = {
@@ -285,7 +287,9 @@ export class BatchEventProcessor extends BaseService implements EventProcessor {
     }
 
     if (this.isNew()) {
-      this.startPromise.reject(new OptimizelyError(EVENT_PROCESSOR_STOPPED));
+      this.startPromise.reject(new Error(
+        sprintf(SERVICE_STOPPED_BEFORE_RUNNING, 'BatchEventProcessor')
+      ));
     }
 
     this.state = ServiceState.Stopping;
diff --git a/lib/event_processor/forwarding_event_processor.ts b/lib/event_processor/forwarding_event_processor.ts
index 744ac5975..a0587ab6a 100644
--- a/lib/event_processor/forwarding_event_processor.ts
+++ b/lib/event_processor/forwarding_event_processor.ts
@@ -23,8 +23,8 @@ import { buildLogEvent } from './event_builder/log_event';
 import { BaseService, ServiceState } from '../service';
 import { EventEmitter } from '../utils/event_emitter/event_emitter';
 import { Consumer, Fn } from '../utils/type';
-import { SERVICE_STOPPED_BEFORE_RUNNING } from 'error_message';
-import { OptimizelyError } from '../error/optimizly_error';
+import { SERVICE_STOPPED_BEFORE_RUNNING } from '../service';
+import { sprintf } from '../utils/fns';
 
 class ForwardingEventProcessor extends BaseService implements EventProcessor {
   private dispatcher: EventDispatcher;
@@ -57,7 +57,9 @@ class ForwardingEventProcessor extends BaseService implements EventProcessor {
     }
 
     if (this.isNew()) {
-      this.startPromise.reject(new OptimizelyError(SERVICE_STOPPED_BEFORE_RUNNING));
+      this.startPromise.reject(new Error(
+        sprintf(SERVICE_STOPPED_BEFORE_RUNNING, 'ForwardingEventProcessor'))
+      );
     }
 
     this.state = ServiceState.Terminated;
diff --git a/lib/message/error_message.ts b/lib/message/error_message.ts
index d820f59ee..b47e718bf 100644
--- a/lib/message/error_message.ts
+++ b/lib/message/error_message.ts
@@ -41,7 +41,6 @@ export const NO_EVENT_PROCESSOR = 'No event processor is provided';
 export const NO_VARIATION_FOR_EXPERIMENT_KEY = 'No variation key %s defined in datafile for experiment %s.';
 export const ODP_CONFIG_NOT_AVAILABLE = 'ODP config is not available.';
 export const ODP_EVENT_FAILED = 'ODP event send failed.';
-export const ODP_EVENT_MANAGER_IS_NOT_RUNNING = 'ODP event manager is not running.';
 export const ODP_EVENTS_SHOULD_HAVE_ATLEAST_ONE_KEY_VALUE = 'ODP events should have at least one key-value pair in identifiers.';
 export const ODP_EVENT_FAILED_ODP_MANAGER_MISSING = 'ODP Event failed to send. (ODP Manager not available).';
 export const ODP_NOT_INTEGRATED = 'ODP is not integrated';
@@ -89,25 +88,16 @@ export const REQUEST_TIMEOUT = 'Request timeout';
 export const REQUEST_ERROR = 'Request error';
 export const NO_STATUS_CODE_IN_RESPONSE = 'No status code in response';
 export const UNSUPPORTED_PROTOCOL = 'Unsupported protocol: %s';
-export const ONREADY_TIMEOUT = 'onReady timeout expired after %s ms';
-export const INSTANCE_CLOSED = 'Instance closed';
-export const DATAFILE_MANAGER_STOPPED = 'Datafile manager stopped before it could be started';
-export const FAILED_TO_FETCH_DATAFILE = 'Failed to fetch datafile';
-export const NO_SDKKEY_OR_DATAFILE = 'At least one of sdkKey or datafile must be provided';
 export const RETRY_CANCELLED = 'Retry cancelled';
-export const SERVICE_STOPPED_BEFORE_RUNNING = 'Service stopped before running';
 export const ONLY_POST_REQUESTS_ARE_SUPPORTED = 'Only POST requests are supported';
 export const SEND_BEACON_FAILED = 'sendBeacon failed';
-export const FAILED_TO_DISPATCH_EVENTS = 'Failed to dispatch events'
-export const FAILED_TO_DISPATCH_EVENTS_WITH_ARG = 'Failed to dispatch events: %s';
-export const EVENT_PROCESSOR_STOPPED = 'Event processor stopped before it could be started';
-export const ODP_MANAGER_STOPPED_BEFORE_RUNNING = 'odp manager stopped before running';
+export const FAILED_TO_DISPATCH_EVENTS = 'Failed to dispatch events, status: %s';
 export const ODP_EVENT_MANAGER_STOPPED = "ODP event manager stopped before it could start";
-export const DATAFILE_MANAGER_FAILED_TO_START = 'Datafile manager failed to start';
 export const UNABLE_TO_ATTACH_UNLOAD = 'unable to bind optimizely.close() to page unload event: "%s"';
 export const UNABLE_TO_PARSE_AND_SKIPPED_HEADER = 'Unable to parse & skipped header item';
 export const CMAB_FETCH_FAILED = 'CMAB decision fetch failed with status: %s';
 export const INVALID_CMAB_FETCH_RESPONSE = 'Invalid CMAB fetch response';
 export const PROMISE_NOT_ALLOWED = "Promise value is not allowed in sync operation";
+export const SERVICE_NOT_RUNNING = "%s not running";
 
 export const messages: string[] = [];
diff --git a/lib/odp/event_manager/odp_event_manager.ts b/lib/odp/event_manager/odp_event_manager.ts
index a076655b5..3a9c591cc 100644
--- a/lib/odp/event_manager/odp_event_manager.ts
+++ b/lib/odp/event_manager/odp_event_manager.ts
@@ -27,14 +27,16 @@ import {
   EVENT_ACTION_INVALID,
   EVENT_DATA_INVALID,
   FAILED_TO_SEND_ODP_EVENTS,
-  ODP_EVENT_MANAGER_IS_NOT_RUNNING,
   ODP_EVENTS_SHOULD_HAVE_ATLEAST_ONE_KEY_VALUE,
   ODP_NOT_INTEGRATED,
-  FAILED_TO_DISPATCH_EVENTS_WITH_ARG,
-  ODP_EVENT_MANAGER_STOPPED
+  FAILED_TO_DISPATCH_EVENTS,
+  ODP_EVENT_MANAGER_STOPPED,
+  SERVICE_NOT_RUNNING
 } from 'error_message';
 import { OptimizelyError } from '../../error/optimizly_error';
 import { LoggerFacade } from '../../logging/logger';
+import { SERVICE_STOPPED_BEFORE_RUNNING } from '../../service';
+import { sprintf } from '../../utils/fns';
 
 export interface OdpEventManager extends Service {
   updateConfig(odpIntegrationConfig: OdpIntegrationConfig): void;
@@ -86,7 +88,7 @@ export class DefaultOdpEventManager extends BaseService implements OdpEventManag
   private async executeDispatch(odpConfig: OdpConfig, batch: OdpEvent[]): Promise<unknown> {
     const res = await this.apiManager.sendEvents(odpConfig, batch);
     if (res.statusCode && !isSuccessStatusCode(res.statusCode)) {
-      return Promise.reject(new OptimizelyError(FAILED_TO_DISPATCH_EVENTS_WITH_ARG, res.statusCode));
+      return Promise.reject(new OptimizelyError(FAILED_TO_DISPATCH_EVENTS, res.statusCode));
     }
     return await Promise.resolve(res);
   }
@@ -113,7 +115,7 @@ export class DefaultOdpEventManager extends BaseService implements OdpEventManag
   }
 
   start(): void {
-    if (!this.isNew) {
+    if (!this.isNew()) {
       return;
     }
 
@@ -164,7 +166,9 @@ export class DefaultOdpEventManager extends BaseService implements OdpEventManag
     }
 
     if (this.isNew()) {
-      this.startPromise.reject(new OptimizelyError(ODP_EVENT_MANAGER_STOPPED));
+      this.startPromise.reject(new Error(
+        sprintf(SERVICE_STOPPED_BEFORE_RUNNING, 'OdpEventManager')
+      ));
     }
 
     this.flush();
@@ -174,7 +178,7 @@ export class DefaultOdpEventManager extends BaseService implements OdpEventManag
 
   sendEvent(event: OdpEvent): void {
     if (!this.isRunning()) {
-      this.logger?.error(ODP_EVENT_MANAGER_IS_NOT_RUNNING);
+      this.logger?.error(SERVICE_NOT_RUNNING, 'OdpEventManager');
       return;
     }
 
diff --git a/lib/odp/odp_manager.ts b/lib/odp/odp_manager.ts
index 68a2b2c79..8baaed658 100644
--- a/lib/odp/odp_manager.ts
+++ b/lib/odp/odp_manager.ts
@@ -29,8 +29,8 @@ import { CLIENT_VERSION, JAVASCRIPT_CLIENT_ENGINE } from '../utils/enums';
 import { ODP_DEFAULT_EVENT_TYPE, ODP_EVENT_ACTION, ODP_USER_KEY } from './constant';
 import { isVuid } from '../vuid/vuid';
 import { Maybe } from '../utils/type';
-import { ODP_MANAGER_STOPPED_BEFORE_RUNNING } from 'error_message';
-import { OptimizelyError } from '../error/optimizly_error';
+import { sprintf } from '../utils/fns';
+import { SERVICE_STOPPED_BEFORE_RUNNING } from '../service';
 
 export interface OdpManager extends Service {
   updateConfig(odpIntegrationConfig: OdpIntegrationConfig): boolean;
@@ -151,7 +151,9 @@ export class DefaultOdpManager extends BaseService implements OdpManager {
     }
 
     if (!this.isRunning()) {
-      this.startPromise.reject(new OptimizelyError(ODP_MANAGER_STOPPED_BEFORE_RUNNING));
+      this.startPromise.reject(new Error(
+        sprintf(SERVICE_STOPPED_BEFORE_RUNNING, 'OdpManager')
+      ));
     }
 
     this.state = ServiceState.Stopping;
diff --git a/lib/optimizely/index.tests.js b/lib/optimizely/index.tests.js
index 5ec683a92..77ce8e0f1 100644
--- a/lib/optimizely/index.tests.js
+++ b/lib/optimizely/index.tests.js
@@ -44,10 +44,10 @@ import {
   NOT_TRACKING_USER,
   EVENT_KEY_NOT_FOUND,
   INVALID_EXPERIMENT_KEY,
-  ONREADY_TIMEOUT,
   SERVICE_STOPPED_BEFORE_RUNNING
 } from 'error_message';
 
+import { ONREADY_TIMEOUT, INSTANCE_CLOSED } from './';
 import {
   AUDIENCE_EVALUATION_RESULT_COMBINED,
   USER_NOT_IN_EXPERIMENT,
@@ -9455,8 +9455,7 @@ describe('lib/optimizely', function() {
         return readyPromise.then(() => {
           return Promise.reject(new Error('PROMISE_SHOULD_NOT_HAVE_RESOLVED'));
         }, (err) => {
-          assert.equal(err.baseMessage, ONREADY_TIMEOUT);
-          assert.deepEqual(err.params, [ 500 ]);
+          assert.equal(err.message, sprintf(ONREADY_TIMEOUT, 500));
         });
       });
 
@@ -9479,8 +9478,7 @@ describe('lib/optimizely', function() {
         return readyPromise.then(() => {
           return Promise.reject(new Error('PROMISE_SHOULD_NOT_HAVE_RESOLVED'));
         }, (err) => {
-          assert.equal(err.baseMessage, ONREADY_TIMEOUT);
-          assert.deepEqual(err.params, [ 30000 ]);
+          assert.equal(err.message, sprintf(ONREADY_TIMEOUT, 30000));
         });
       });
 
diff --git a/lib/optimizely/index.ts b/lib/optimizely/index.ts
index 6895fcea7..09b7d47d9 100644
--- a/lib/optimizely/index.ts
+++ b/lib/optimizely/index.ts
@@ -59,7 +59,7 @@ import {
   NODE_CLIENT_ENGINE,
   CLIENT_VERSION,
 } from '../utils/enums';
-import { Fn, Maybe, OpType, OpValue } from '../utils/type';
+import { Fn, Maybe, OpType } from '../utils/type';
 import { resolvablePromise } from '../utils/promise/resolvablePromise';
 
 import { NOTIFICATION_TYPES, DecisionNotificationType, DECISION_NOTIFICATION_TYPES } from '../notification_center/type';
@@ -75,9 +75,6 @@ import {
   EVENT_KEY_NOT_FOUND,
   NOT_TRACKING_USER,
   VARIABLE_REQUESTED_WITH_WRONG_TYPE,
-  ONREADY_TIMEOUT,
-  INSTANCE_CLOSED,
-  SERVICE_STOPPED_BEFORE_RUNNING
 } from 'error_message';
 
 import {
@@ -98,6 +95,8 @@ import {
   VARIABLE_NOT_USED_RETURN_DEFAULT_VARIABLE_VALUE,
 } from 'log_message';
 
+import { SERVICE_STOPPED_BEFORE_RUNNING } from '../service';
+
 import { ErrorNotifier } from '../error/error_notifier';
 import { ErrorReporter } from '../error/error_reporter';
 import { OptimizelyError } from '../error/optimizly_error';
@@ -113,6 +112,9 @@ type StringInputs = Partial<Record<InputKey, unknown>>;
 
 type DecisionReasons = (string | number)[];
 
+export const INSTANCE_CLOSED = 'Instance closed';
+export const ONREADY_TIMEOUT = 'onReady timeout expired after %s ms';
+
 /**
  * options required to create optimizely object
  */
@@ -1257,7 +1259,9 @@ export default class Optimizely extends BaseService implements Client {
     }
 
     if (!this.isRunning()) {
-      this.startPromise.reject(new OptimizelyError(SERVICE_STOPPED_BEFORE_RUNNING));
+      this.startPromise.reject(new Error(
+        sprintf(SERVICE_STOPPED_BEFORE_RUNNING, 'Client')
+      ));
     }
 
     this.state = ServiceState.Stopping;
@@ -1322,14 +1326,16 @@ export default class Optimizely extends BaseService implements Client {
 
     const onReadyTimeout = () => {
       this.cleanupTasks.delete(cleanupTaskId);
-      timeoutPromise.reject(new OptimizelyError(ONREADY_TIMEOUT, timeoutValue));
+      timeoutPromise.reject(new Error(
+        sprintf(ONREADY_TIMEOUT, timeoutValue)
+      ));
     };
     
     const readyTimeout = setTimeout(onReadyTimeout, timeoutValue);
     
     this.cleanupTasks.set(cleanupTaskId, () => {
       clearTimeout(readyTimeout);
-      timeoutPromise.reject(new OptimizelyError(INSTANCE_CLOSED));
+      timeoutPromise.reject(new Error(INSTANCE_CLOSED));
     });
 
     return Promise.race([this.onRunning().then(() => {
diff --git a/lib/project_config/polling_datafile_manager.ts b/lib/project_config/polling_datafile_manager.ts
index bac6adc1e..fbbbeb0e0 100644
--- a/lib/project_config/polling_datafile_manager.ts
+++ b/lib/project_config/polling_datafile_manager.ts
@@ -24,10 +24,8 @@ import { Repeater } from '../utils/repeater/repeater';
 import { Consumer, Fn } from '../utils/type';
 import { isSuccessStatusCode } from '../utils/http_request_handler/http_util';
 import { 
-  DATAFILE_MANAGER_STOPPED,
   DATAFILE_FETCH_REQUEST_FAILED,
   ERROR_FETCHING_DATAFILE,
-  FAILED_TO_FETCH_DATAFILE,
 } from 'error_message';
 import {
   ADDING_AUTHORIZATION_HEADER_WITH_BEARER_TOKEN,
@@ -40,6 +38,10 @@ import { LoggerFacade } from '../logging/logger';
 
 export const LOGGER_NAME = 'PollingDatafileManager';
 
+import { SERVICE_STOPPED_BEFORE_RUNNING } from '../service';
+
+export const FAILED_TO_FETCH_DATAFILE = 'Failed to fetch datafile';
+
 export class PollingDatafileManager extends BaseService implements DatafileManager {
   private requestHandler: RequestHandler;
   private currentDatafile?: string;
@@ -123,7 +125,9 @@ export class PollingDatafileManager extends BaseService implements DatafileManag
     }
 
     if (this.isNew() || this.isStarting()) {
-      this.startPromise.reject(new OptimizelyError(DATAFILE_MANAGER_STOPPED));
+      this.startPromise.reject(new Error(
+        sprintf(SERVICE_STOPPED_BEFORE_RUNNING, 'PollingDatafileManager')
+      ));
     }
     
     this.state = ServiceState.Terminated;
@@ -136,7 +140,7 @@ export class PollingDatafileManager extends BaseService implements DatafileManag
   private handleInitFailure(): void {
     this.state = ServiceState.Failed;
     this.repeater.stop();
-    const error = new OptimizelyError(FAILED_TO_FETCH_DATAFILE);
+    const error = new Error(FAILED_TO_FETCH_DATAFILE);
     this.startPromise.reject(error);
     this.stopPromise.reject(error);
   }
diff --git a/lib/project_config/project_config_manager.spec.ts b/lib/project_config/project_config_manager.spec.ts
index 3e3236644..a8c98ece4 100644
--- a/lib/project_config/project_config_manager.spec.ts
+++ b/lib/project_config/project_config_manager.spec.ts
@@ -209,10 +209,10 @@ describe('ProjectConfigManagerImpl', () => {
 
       describe('when datafile is invalid', () => {
         it('should reject onRunning() with the same error if datafileManager.onRunning() rejects', async () => {
-          const datafileManager = getMockDatafileManager({ onRunning: Promise.reject('test error') });
+          const datafileManager = getMockDatafileManager({ onRunning: Promise.reject(new Error('test error')) });
           const manager = new ProjectConfigManagerImpl({ datafile: {}, datafileManager });
           manager.start();
-          await expect(manager.onRunning()).rejects.toBe('test error');
+          await expect(manager.onRunning()).rejects.toThrow('DatafileManager failed to start, reason: test error');
         });
 
         it('should resolve onRunning() if datafileManager.onUpdate() is fired and should update config', async () => {
@@ -258,10 +258,10 @@ describe('ProjectConfigManagerImpl', () => {
 
     describe('when datafile is not provided', () => {
       it('should reject onRunning() if datafileManager.onRunning() rejects', async () => {
-        const datafileManager = getMockDatafileManager({ onRunning: Promise.reject('test error') });
+        const datafileManager = getMockDatafileManager({ onRunning: Promise.reject(new Error('test error')) });
         const manager = new ProjectConfigManagerImpl({ datafileManager });
         manager.start();
-        await expect(manager.onRunning()).rejects.toBe('test error');
+        await expect(manager.onRunning()).rejects.toThrow('DatafileManager failed to start, reason: test error');
       });
 
       it('should reject onRunning() and onTerminated if datafileManager emits an invalid datafile in the first onUpdate', async () => {
diff --git a/lib/project_config/project_config_manager.ts b/lib/project_config/project_config_manager.ts
index 95e3fa029..edf88a174 100644
--- a/lib/project_config/project_config_manager.ts
+++ b/lib/project_config/project_config_manager.ts
@@ -22,9 +22,16 @@ import { scheduleMicrotask } from '../utils/microtask';
 import { Service, ServiceState, BaseService } from '../service';
 import { Consumer, Fn, Transformer } from '../utils/type';
 import { EventEmitter } from '../utils/event_emitter/event_emitter';
-import { DATAFILE_MANAGER_STOPPED, NO_SDKKEY_OR_DATAFILE, DATAFILE_MANAGER_FAILED_TO_START } from 'error_message';
-import { OptimizelyError } from '../error/optimizly_error';
 
+import { 
+  SERVICE_FAILED_TO_START,
+  SERVICE_STOPPED_BEFORE_RUNNING,
+} from '../service'
+
+export const NO_SDKKEY_OR_DATAFILE = 'sdkKey or datafile must be provided';
+export const GOT_INVALID_DATAFILE = 'got invalid datafile';
+
+import { sprintf } from '../utils/fns';
 interface ProjectConfigManagerConfig {
   datafile?: string | Record<string, unknown>;
   jsonSchemaValidator?: Transformer<unknown, boolean>,
@@ -82,7 +89,7 @@ export class ProjectConfigManagerImpl extends BaseService implements ProjectConf
     this.state = ServiceState.Starting;
 
     if (!this.datafile && !this.datafileManager) {
-      this.handleInitError(new OptimizelyError(NO_SDKKEY_OR_DATAFILE));
+      this.handleInitError(new Error(NO_SDKKEY_OR_DATAFILE));
       return;
     }
 
@@ -119,14 +126,16 @@ export class ProjectConfigManagerImpl extends BaseService implements ProjectConf
   }
 
   private handleDatafileManagerError(err: Error): void {
-    this.logger?.error(DATAFILE_MANAGER_FAILED_TO_START, err);
+    this.logger?.error(SERVICE_FAILED_TO_START, 'DatafileManager', err.message);
 
     // If datafile manager onRunning() promise is rejected, and the project config manager 
     // is still in starting state, that means a datafile was not provided in cofig or was invalid, 
     // otherwise the state would have already been set to running synchronously.
     // In this case, we cannot recover.
     if (this.isStarting()) {
-      this.handleInitError(err);
+      this.handleInitError(new Error(
+        sprintf(SERVICE_FAILED_TO_START, 'DatafileManager', err.message)
+      ));
     }
   }
 
@@ -173,7 +182,7 @@ export class ProjectConfigManagerImpl extends BaseService implements ProjectConf
       const fatalError = (this.isStarting() && !this.datafileManager) ||
         (this.isStarting() && !fromConfig);
       if (fatalError) {
-        this.handleInitError(err);
+        this.handleInitError(new Error(GOT_INVALID_DATAFILE));
       }
     }
   }
@@ -206,7 +215,9 @@ export class ProjectConfigManagerImpl extends BaseService implements ProjectConf
     }
 
     if (this.isNew() || this.isStarting()) {
-      this.startPromise.reject(new OptimizelyError(DATAFILE_MANAGER_STOPPED));
+      this.startPromise.reject(new Error(
+        sprintf(SERVICE_STOPPED_BEFORE_RUNNING, 'ProjectConfigManager')
+      ));
     }
 
     this.state = ServiceState.Stopping;
diff --git a/lib/service.ts b/lib/service.ts
index b024ef510..3022aa806 100644
--- a/lib/service.ts
+++ b/lib/service.ts
@@ -1,5 +1,5 @@
 /**
- * Copyright 2024 Optimizely
+ * Copyright 2024-2025 Optimizely
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,6 +17,8 @@
 import { LoggerFacade, LogLevel, LogLevelToLower } from './logging/logger'
 import { resolvablePromise, ResolvablePromise } from "./utils/promise/resolvablePromise";
 
+export const SERVICE_FAILED_TO_START = '%s failed to start, reason: %s';
+export const SERVICE_STOPPED_BEFORE_RUNNING = '%s stopped before running';
 
 /**
  * The service interface represents an object with an operational state,