Hi there, I just downloaded a new 4.27 project from the Marketplace and tried packaging it. Unfortunately, I’m unable to reproduce the same issue on my end. Are you getting this error in a newly downloaded project?
Regardless, I’m guessing this is an engine issue, but one possible solution (Failed Import : Array Property) would be to go to the four variables mentioned in the error and set their Instance Editable parameter to True. Let me know if that works out for you.