This occurred at Galaxy Main https://usegalaxy.org, correct? Check the URL where you are working to confirm.
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First, try at least one rerun.
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Should that fail again, click on the bug icon for the error dataset and review the error message.
You can post back the error message here for more help, compare to the FAQ below, or submit the bug report. It is important make sure all inputs/outputs are undeleted for review. Please include a link to this post in the comments so we can link the two.
FAQ: Troubleshooting resources for errors or unexpected results
Thanks!