Update app.py

app.py

@@ -523,3 +523,34 @@ if __name__ == "__main__":
         print("FATAL: demo.launch failed:", e, flush=True)
         traceback.print_exc()
         raise
+
+
+
+
+# Safe launch: only launch if demo exists
+if __name__ == "__main__":
+    port = int(os.environ.get("PORT", 7860))
+    print("DEBUG: preparing to launch Gradio on port", port, flush=True)
+    try:
+        if 'demo' in globals() and demo is not None:
+            print("DEBUG: demo object found. launching...", flush=True)
+            demo.queue().launch(server_name="0.0.0.0", server_port=port)
+        else:
+            print("FATAL: 'demo' not found. The Gradio UI block may be missing or failed to create.", flush=True)
+            # show the tail of the file so you can inspect quickly in logs
+            try:
+                import inspect
+                import pathlib
+                print("DEBUG: last 60 lines of /app/app.py for inspection:", flush=True)
+                with open("/app/app.py", "r", encoding="utf-8") as fh:
+                    all_lines = fh.read().splitlines()
+                    for ln in all_lines[-60:]:
+                        print(ln)
+            except Exception:
+                pass
+            # Exit non-zero so platform reports failure clearly
+            sys.exit(1)
+    except Exception as e:
+        print("FATAL: demo.launch failed:", e, flush=True)
+        traceback.print_exc()
+        raise