Update app.py

app.py

@@ -18,7 +18,8 @@
 #   hotel_cancel_model_dataset.csv, features.json, dataset_meta.json, train.csv, test.csv
 #   artifacts/py/... and artifacts/r/...
 # ============================================================
-
+import sys
+import traceback
 import json
 import os
 import subprocess
@@ -445,4 +446,25 @@ with gr.Blocks(title="Hotel Booking Cancellation Prediction") as demo:
 # 6) Launch
 # ============================================================
 if __name__ == "__main__":
-    demo.launch(server_name="0.0.0.0", server_port=7860)
+    import sys
+    import traceback
+
+    try:
+        print("✅ app.py starting...", flush=True)
+
+        # Hugging Face may provide PORT environment variable
+        port = int(os.getenv("PORT", os.getenv("GRADIO_SERVER_PORT", "7860")))
+        host = os.getenv("GRADIO_SERVER_NAME", "0.0.0.0")
+
+        print(f"✅ Launching Gradio on {host}:{port}", flush=True)
+
+        demo.launch(
+            server_name=host,
+            server_port=port,
+            debug=True,
+            show_error=True
+        )
+    except Exception:
+        print("❌ App crashed during startup:", flush=True)
+        traceback.print_exc()
+        sys.exit(1)