diff --git a/packages/ide/vscode/package.json b/packages/ide/vscode/package.json
index 44f22fcc..634044c6 100644
--- a/packages/ide/vscode/package.json
+++ b/packages/ide/vscode/package.json
@@ -1,7 +1,7 @@
 {
     "name": "zenstack-v3",
     "publisher": "zenstack",
-    "version": "3.0.9",
+    "version": "3.0.11",
     "displayName": "ZenStack V3 Language Tools",
     "description": "VSCode extension for ZenStack (v3) ZModel language",
     "private": true,
diff --git a/packages/language/src/module.ts b/packages/language/src/module.ts
index cff4ac0e..df83d4e0 100644
--- a/packages/language/src/module.ts
+++ b/packages/language/src/module.ts
@@ -94,6 +94,8 @@ export function createZModelLanguageServices(
 
     // when documents reach Parsed state, inspect plugin declarations and load corresponding
     // plugin zmodel docs
+    // Note we must use `onBuildPhase` instead of `onDocumentPhase` here because the latter is
+    // not called when not running inside a language server.
     shared.workspace.DocumentBuilder.onBuildPhase(DocumentState.Parsed, async (documents) => {
         for (const doc of documents) {
             if (doc.parseResult.lexerErrors.length > 0 || doc.parseResult.parserErrors.length > 0) {
@@ -101,6 +103,10 @@ export function createZModelLanguageServices(
                 continue;
             }
 
+            if (doc.uri.scheme !== 'file') {
+                continue;
+            }
+
             const schemaPath = fileURLToPath(doc.uri.toString());
             const pluginSchemas = getPluginDocuments(doc.parseResult.value as Model, schemaPath);
             for (const plugin of pluginSchemas) {