Update app.py

app.py

@@ -70,7 +70,7 @@ final_answer = FinalAnswerTool()
 
 
 model = LiteLLMModel(
-        model_id="ollama_chat/qwen2:7b",  # Or try other Ollama-supported models
+        model_id="ollama/qwen2:7b",  # Or try other Ollama-supported models
         api_base="http://127.0.0.1:11434",  # Default Ollama local server
         num_ctx=8192,
     )