When importing issues via CSV, if there is a field required that it's not present in the CSV file, it throws an error message stating that:

Error importing issue [externalId='autoid--##########', summary='########']: Unable to create issue: ######

This could be caused by required fields in the field configuration or validators in the create transition of the respective workflow.

It would be nice to have a clear message on why the issue occurred compiling all require fields.