Hi @yankeesong,
It is because matplotlib is not installed in your current runtime environment.
You can do so by adding it in your environment.yml file. In case you are an advanced linux user, and want to see all the ways you can configure runtime environment, you can read this FAQ post.
You can view the logs for debug submissions (i.e. debug: true, in aicrowd.json) yourself by clicking on link present in your GitLab issue. Something like below:
Logs for Admin Reference : agent-logs | pod_spec-logs | error_trace-logs |
Let me know in case you have any follow up question.