Issue with nbconvert

[RWillisConger]

A handful of students have issues using nbconvert to submit their assignments. They have not had issues with previous homeworks, and updating the package has not resolved the error. I can include more information or the entire file if useful, but here is the text of the error:

[chrispyles]

The LateFailed error usually happens when the LaTeX exporter generates no contents. Please send a copy of the notebook. If you don't want it posted publicly, feel free to PM me on Slack (link in README).

[RWillisConger]

Thank you! Just sent

[chrispyles]

Resolved on Slack.

For anyone who finds this thread, the issue was that none of the questions were marked as manually-graded (manual: true in question config), so when filtering the notebook for PDF export (which is the default behavior), there were no cells left to include in the PDF.

Solution is either to a) mark relevant cells with manual: true, b) set export_cell: filtering: false in the assignment config, or c) if the notebook has already been sent to students, if this is a notebook you’ve already sent out to students, you can tell them to add a new cell at the bottom with

grader.export(run_tests=True, filtering=False)

and run that instead of the one already in the notebook. (Otter makes the cells it generates non-editable so it’s probably easier to tell students to add a new cell rather than having them edit the cell metadata.)