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You can update the function signature in \resources\app\api\shared\replace.gml (and paste a new fnames file to api\v23 to have new functions)

Thank you kindly. I’ve updated instance_create_layer with an extra value, I wasn’t sure how to identify it as a structure, but leaving it blank allowed the error to clear.

I think part of my problem was also needing the latest Builder - which I’ve since updated via Github to ver 1.24, and my project is compiling via GMEdit now - thank you! ☕