Update app.py

app.py

@@ -239,43 +239,65 @@ def create_app():
 # Spaces will automatically detect Gradio and run this
 # The demo variable must be exposed at module level for Spaces to detect it
 
-try:
-    print("🔄 Starting app initialization...")
-    demo = create_app()
-    print("✅ App created successfully!")
-    print(f"✅ Demo type: {type(demo)}")
-    print(f"✅ Demo object: {demo}")
-except Exception as e:
-    print(f"❌ Fatal error creating app: {e}")
-    import traceback
-    traceback.print_exc()
-    
-    # Create a minimal error interface
-    import gradio as gr
-    
-    def show_error():
-        return f"""
-        # ❌ Application Error
+# Initialize demo to None first
+demo = None
+
+# Only initialize once (prevent duplicate initialization)
+if demo is None:
+    try:
+        print("🔄 Starting app initialization...")
+        demo = create_app()
+        print("✅ App created successfully!")
+        print(f"✅ Demo type: {type(demo)}")
+        print(f"✅ Demo object: {demo}")
+        
+        # Verify demo is a valid Gradio Blocks object
+        if demo is None:
+            raise ValueError("Demo object is None after creation")
+        if not hasattr(demo, 'launch'):
+            raise ValueError("Demo object does not have launch method")
+            
+    except Exception as e:
+        print(f"❌ Fatal error creating app: {e}")
+        import traceback
+        traceback.print_exc()
         
-        **Fatal Error:** {str(e)}
+        # Create a minimal error interface
+        import gradio as gr
         
-        Please check:
-        1. OPENAI_API_KEY is set in Spaces Secrets
-        2. All required files are uploaded
-        3. Check the logs for detailed error information
+        def show_error():
+            return f"""
+            # ❌ Application Error
+            
+            **Fatal Error:** {str(e)}
+            
+            Please check:
+            1. OPENAI_API_KEY is set in Spaces Secrets
+            2. All required files are uploaded
+            3. Check the logs for detailed error information
+            
+            **Traceback:**
+            ```
+            {traceback.format_exc()}
+            ```
+            """
         
-        **Traceback:**
-        ```
-        {traceback.format_exc()}
-        ```
-        """
-    
+        demo = gr.Interface(
+            fn=show_error,
+            inputs=None,
+            outputs=gr.Markdown(),
+            title="CSRC Car Manual RAG System - Error",
+            description="An error occurred. Please check the logs."
+        )
+
+# Final verification
+if demo is None:
+    import gradio as gr
     demo = gr.Interface(
-        fn=show_error,
+        fn=lambda: "Application failed to initialize. Please check the logs.",
         inputs=None,
-        outputs=gr.Markdown(),
-        title="CSRC Car Manual RAG System - Error",
-        description="An error occurred. Please check the logs."
+        outputs="text",
+        title="CSRC Car Manual RAG System - Initialization Failed"
     )
 
 # Note: Do NOT call demo.launch() here