diff --git a/examples/exp_pool/simple.py b/examples/exp_pool/simple.py
index f270824bf..3216e78b8 100644
--- a/examples/exp_pool/simple.py
+++ b/examples/exp_pool/simple.py
@@ -9,8 +9,7 @@ from metagpt.logs import logger
 
 async def main():
     req = "Simple task."
-    resp = "Simple echo."
-    exp = Experience(req=req, resp=resp, entry_type=EntryType.MANUAL)
+    exp = Experience(req=req, resp="echo", entry_type=EntryType.MANUAL)
 
     exp_manager.create_exp(exp)
     logger.info(f"New experience created for the request `{req}`.")