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upgrade RTC 3.0.1 derby to 4.0 error CRJAZ1728E An unexpected error

jts upgraded successfully to 4.0
upgrade RTC 3.0.1 derby to 4.0 encountered error CRJAZ1728E An unexpected error has been detected. See the log file "D:\CLM40\JazzTeamServer\server\repotools-jazz_migration_ccm_updateConfigurationFiles.log" for more details.
Seen this ? What gives ? How to fix it ?
Got resolution, as this is a repeat error
One answer

Already asked and answered in https://jazz.net/forum/questions/83899/error-upgrading-from-3011-to-40-custom-plugin-related