Unity error message: "Exchange list generation fail : Code generation failure"

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Control Expert (formerly Unity Pro) error message: "Exchange list generation fail : Code generation failure"

Problem:
The user is editing online and receives the error and cannot proceed with a "Build changes" or "Rebuild All Project".

Environment:
Control Expert/Unity Pro software online with a PLC.

Resolution:
A change has been made that should be made in offline mode.
It requires disconnecting and performing a "Rebuild All" followed by a download.