Hi @parthu-reddy,
This is usually an indication of an outside process accessing this file. To verify this, if you restart ProGet, access to that file will be restored. If it is still locked, then something external to ProGet is accessing it. The most likely culprit is an antivirus scanning that file when ProGet attempts to access it.
Can you restart ProGet and see if there is still a file-locking issue? If the file is still locked, can you verify that you do not have an antivirus solution that is constantly scanning that file and locking it?
Thanks,
Dan