I cannot quite reproduce this myself yet, but the theoretical steps to reproduce are:
Create a prior assignment with teams, and have students submit
Create a new assignment without teams. (I don't know if the choice of graders is important here, yet)
As the professor, submit once to test the graders
Edit the assignment and add a teamset by choosing [Copy from existing] and selecting the prior assignment's teamset
This seems to crash.
I don't know whether students need to submit to the new assignment also before you convert to teams, or whether there's some other step missing in this list, yet...
I cannot quite reproduce this myself yet, but the theoretical steps to reproduce are:
I don't know whether students need to submit to the new assignment also before you convert to teams, or whether there's some other step missing in this list, yet...