Update PlanWriterCtrlFlow.py

PlanWriterCtrlFlow.py

@@ -85,7 +85,7 @@ class PlanWriterCtrlFlow(ChatAtomicFlow):
             response = json.loads(api_output)
             return response
         except json.decoder.JSONDecodeError:
-            new_goal = f"Here is your previous response {api_output}, it cannot be parsed with json.loads, please fix this issue."
+            new_goal = f"Here is your previous response {api_output}, it cannot be parsed with json.loads, please fix this issue. Provide your response only in JSON format."
             new_input_data = input_data.copy()
             new_input_data['goal'] = new_goal
             new_api_output = super().run(new_input_data)["api_output"].strip()