Error: Unable to create iterator for user activity usage

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This is only happening in 1 course, so I assume it's a bug, but would appreciate confirmation before I log a ticket.

 

Steps to replicate:

  1. Open the Assignments page.
  2. Click the integer under New Submissions.

Result: Receive a blank page with the message, "Unable to create iterator for user activity usage"

 

If the evaluator views all submissions, they are able to filter to the unevaluated assignments and grade them from there.