Add error handling for demo initialization

app.py

@@ -368,4 +368,13 @@ if __name__ == "__main__":
     main()
 
 # For Gradio Spaces
-demo = build_interface()
+try:
+    demo = build_interface()
+except Exception as e:
+    print(f"Error building interface: {e}")
+    import traceback
+    traceback.print_exc()
+    # Fallback minimal demo
+    with gr.Blocks() as demo:
+        gr.Markdown("# Error loading visualizer")
+        gr.Markdown(f"Error: {str(e)}")