missing "assignment_source_id" attribute.
Hi, @matusiakmark , I apologize that no one has yet responded to this; were you able to resolve it on your own?
I believe that this means that the assignment was not assigned to everyone in the section OR certain people received a different due date than others.
Here is a resource that I have created for my teachers to help them understand that error:
@MrReedThank you so much for generously sharing your slide presentation. It definitely hits the most commonly experienced missteps in grade sync! Super helpful.