Check that your THREADDIA collumn in your table isn't filled with an expression. It has to be filled in manually, otherwise you'll get an error regarding the family table.
And of course, check if you're working in the right project where the custom library is declared, but that would be too obvious
In addition to this, also make sure that all collumns with expressions are no longer 'black' but expressed, in blue. This also could be a reason for not showing up in the Bolted Connection ...
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