i think you are in
Contribution Manager / Tools / G4P GUI Builder ( v 4.3 )
but need to install also:
Contribution Manager / Libraries / G4P ( v4.2.0 )
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This warning is given if you launch GUI Builder but you have not installed G4P.
@kll is correct you need to install G4P via the Contributions Manager
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Thank you for helping me solve this problem.