Better exception capture to diagnose generation failure

app.py

@@ -95,7 +95,7 @@ def respond(message: str, history: list[dict], max_new_tokens: int, temperature:
         try:
             model.generate(**gen_kwargs)
         except Exception as e:
-            gen_exception.append(e)
+            gen_exception.append(f"{type(e).__name__}: {repr(e)}")
             streamer.end()
 
     thread = threading.Thread(target=generate_with_catch, daemon=True)