darren
3
@Nancy_Robertson Does the error look similar to the ones in this post?
Can you share the Project ID? This can be found in the Url when editing the app:
Thunkable5c7c37b110fa3884a1a83f12/Home/designer
I believe this is a rare known issue that @domhnallohanlon can address.
Any additional details / screenshots of the error would also be helpful.