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In cases where more than one field is being used in a join, the "Join (Tool ID) String fields can only be joined to other string fields" error message could be improved by indicating which field has a mismatch.
For example, if I'm joining Fields A, B, C, D... to fields Z, Y, X, W... in Join tool 24, and for some reason Field Z gets changed from String to Double, it'd be nice to see a message like:
"Join (24) (Field 1) String Fields can only be joined to other String fields"
"Join (24) String Fields can only be joined to other String fields (A)"
So that I know I need to go to a select tool and change the type of either A or Z.
Otherwise I look at the Join tool output and try to figure out which pair no longer has matching types, which can take a minute when dealing with a multiple-point join.