# Training crew error

**URL:** <https://community.crewai.com/t/training-crew-error/535>\
**Category:** CrewAI Community Support\
**Created:** [September 25, 2024, 3:26am UTC](https://community.crewai.com/t/training-crew-error/535 "2024-09-25T03:26:25Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Rainismer](https://sea1.discourse-cdn.com/flex025/user_avatar/community.crewai.com/rainismer/32/90_2.png) [@Rainismer](https://community.crewai.com/u/Rainismer)\
**Post date:** [September 25, 2024, 3:26am UTC](https://community.crewai.com/t/training-crew-error/535/1 "2024-09-25T03:26:25Z")

</div>

Python version: 3.11  
Poetry version: 1.8.3  
CrewAI version: 0.63.6  
Crew-tools version: 0.12.1

Traceback (most recent call last):  
File “D:\AIGC\idataai\_py\test\crewai\_test.py”, line 126, in   
crew.train(n\_iterations=2, filename=“crewai\_test.pkl”)  
File “D:\AIGC\idataai\_py\venv\Lib\site-packages\crewai\crew.py”, line 444, in train  
result = TaskEvaluator(agent).evaluate\_training\_data(  
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  
File “D:\AIGC\idataai\_py\venv\Lib\site-packages\crewai\utilities\evaluators\task\_evaluator.py”, line 112, in evaluate\_training\_data  
f"Improved Output:\n{data[‘improved\_output’]}\n\n"  
~~~~ ^^^^^^^^^^^^^^^^^^^  
KeyError: ‘improved\_output’

During handling of the above exception, another exception occurred:

Traceback (most recent call last):  
File “D:\AIGC\idataai\_py\test\crewai\_test.py”, line 128, in   
raise Exception(f"An error occurred while training the crew: {e}")  
Exception: An error occurred while training the crew: ‘improved\_output’

 ![image](https://us1.discourse-cdn.com/flex025/uploads/crewai/original/1X/b40bc3aa0a37cdac74ff5c797ef73f9233d5ae9c.png)