Good morning, S M RAO.
Is it possible that the rebuild process works fine, but then the file gets corrupted again as soon as you launch the runtime a second time?
To test the former, please run vutil -info once the rebuild process is done.
If the lesser is what actually is happening, I invite you to review the following article:
https://portal.microfocus.com/s/article/KM000006724?language=en_US
If the issue persists, please submit a Technical Issue Case to Micro Focus:
https://portal.microfocus.com/
Information about the version of ACUCOBOL-GT you are using, together with the OS you are working on, may be quite useful.