Invalid Type Identifier for Variable Error

I’m guessing this has something to do with attempting to convert path variables to another data type. However a path is generally a string so if that’s the case then this isn’t a well-conceived node. I’ve got two path values, a binary, and a string and I want to convert them all to strings so I can insert them into another table. This cryptic error message isn’t helpful. Is there an alternative because it seems from reading that a lot of folks have run into this error.