Update app.py

app.py

@@ -25,7 +25,7 @@ def invoke(level, question, file_name, ground_truth, openai_api_key):
         os.environ["OPENAI_API_KEY"] = openai_api_key
         answer = run_agent(level, question, file_name)
         del os.environ["OPENAI_API_KEY"]
-        return answer, (answer == ground_truth)
+        return answer, str(answer == ground_truth)
 
 gr.close_all()