can't save instances

[graybeal]

User reports: I have an additional question related to CEDAR template https://cedar.metadatacenter.org/templates/edit/https:/repo.metadatacenter.org/templates/3258a592-a0a0-4822-9eda-5cd757e28926. It shows this error below when I try to populate with just very few metadata - it: Server Error

(This is a template called COVID Project Content, in All / Shared / COVID Training ZonMW M4M Workshops / Project Metadata Template.)

this is the error:

[marcosmro]

I've fixed it. It was the same issue described at #1107. I've attached the broken template as an example to that issue, as well as a diff that shows how to fix it.