What does this error mean?

I tried to add manually one document to the collection, and with flutterflow it wouldn't let me but with firebase it did (I did it because a guy told me it worked for him). I don't understand what is wrong with the CSV itself, because I paid attention to the field names and they are correct.

Edit: I tried to create a new collection with the same fields and it gives me the same error. And I also tried to validate my csv is different websites and they all said my file was valid, so the problem is with flutterflow. I'm gonna make a post on the "report a bug" site.