After Networker upgrade to 9.2.1 from 9.0.1 getting error about license

After upgrading to Networker 9.2.1 we get error:-

CLP/ELMS server for basic license information found the following: 'CLP API returned the following error code -2: associated message is 'License file corrupted". Please obtain the appropriate license feature for the license file.

On running the "nsrlic -C" command I get the following error:-

Checking CLP connection using '/nsr/lic/licspec.properties'.

172537:nsrlic: Unable to check out 'NETWORKER_UPDATE': status = -2 'Invalid license file syntax. (-2,413)'

172537:nsrlic: Unable to check out 'NETWORKER_CAPACITY': status = -2 'Invalid license file syntax. (-2,413)'

Checking license properties file '/nsr/lic/licspec.properties'

Found 'license.path=/nsr/lic/dpa.lic'

Checking license file '/nsr/lic/dpa.lic'

License file '/nsr/lic/dpa.lic' is unserved but contains no 'INCREMENT' line

172527:nsrlic: License file '/nsr/lic/dpa.lic' issues found: 1

After the upgrade due to issue with license we copied the license file from a clone of the server taken before the change and thus it says the license file is unserved.

And the license file is 0 KB.

If we copy the license file back to /nsr/lic/ directory then the command does not give any error & has the correct size.

But if we then reboot the Networker server (linux server) then the file goes back to 0 KB.

Following 2 files were in the /nsr/lic/ directory which I also tried moving to a subdirectory followed by reboot but the issue still persists:

lextab.py

yacctab.py

Has someone seen this and what can I do to troubleshoot this further?