For whatever a reason a file of directory may get locked or blocked by another process or program. To find out which Process Explorer can be used available at https://docs.microsoft.com/en-us/sysinternals/downloads/process-explorer .
Just a record of useful or infrequently used Git snippets: To take all of the changes from the branch to be merged i.e. theirs: File: git-merge-all-their-changes ------------------------- git merge -Xtheirs branch-to-merge