Errors bringing custom output set into Wordfly

Hello all,

I hope you're doing well and staying safe in these strange times.
We're working on creating some custom fields for an Output Set to use with Wordfly. However, it gives us this error message in Wordfly:
It seems to be having trouble accessing the 'fields' within the Output set, and is thus getting cranky. The SQL view that I created as copy-pasted from Tessitura themselves (found here), and everything else appears to be working- the set works with lists within Tessitura, but Wordfly doesn't like it.