Improve error messages and add validation per code review feedback

Co-authored-by: hotlong <[email protected]>

Author: Copilot

packages/kernel/src/plugins/objectql.ts

@@ -23,7 +23,8 @@ export const ObjectOSPlugin: ObjectQLPlugin = {
                         });
                     }
                 } catch (e) {
-                     console.error(`Error loading app from ${ctx.file}:`, e);
+                     console.error(`Error loading app from ${ctx.file}: ${e instanceof Error ? e.message : String(e)}`);
+                     console.error('Expected YAML structure: { name: string, label: string, menu?: [...] }');
                 }
             }
         });
@@ -46,10 +47,13 @@ export const ObjectOSPlugin: ObjectQLPlugin = {
                         const config = entry.content as any;
                         config.data = data; 
                     } else {
+                        const availableObjects = Array.from((ctx.registry as any).store.get('object')?.keys() || []).join(', ') || 'none';
                         console.warn(`Found data for unknown object '${objectName}' in ${ctx.file}`);
+                        console.warn(`Ensure the corresponding ${objectName}.object.yml file exists. Available objects: ${availableObjects}`);
                     }
                 } catch (e) {
-                    console.error(`Error loading data from ${ctx.file}:`, e);
+                    console.error(`Error loading data from ${ctx.file}: ${e instanceof Error ? e.message : String(e)}`);
+                    console.error('Expected YAML structure: Array of objects with field values');
                 }
             }
         });

packages/server/src/objectql/objectql.provider.ts

@@ -67,12 +67,23 @@ export const objectQLProvider: Provider = {
             });
         }
 
+        const presets = config.presets || ['@objectos/preset-base'];
+        
         const objectos = new ObjectOS({
             datasources,
-            presets: config.presets || ['@objectos/preset-base']
+            presets
         });
 
-        await objectos.init();
+        try {
+            await objectos.init();
+        } catch (error) {
+            console.error('Failed to initialize ObjectOS:', error);
+            if (error instanceof Error && error.message.includes('preset')) {
+                console.error(`Hint: Ensure preset packages are installed: ${presets.join(', ')}`);
+            }
+            throw error;
+        }
+        
         return objectos;
     }
 };