Analyse following RPM build log snippet. Describe contents accurately, without speculation or suggestions for resolution.            
Your analysis must be as concise as possible, while keeping relevant information intact.
Snippet: 
Error: Invalid value for '[PATH_OR_URL]': Cmd('git') failed due to: exit code(1)
  cmdline: git merge pr-changes/12949
  stdout: 'Auto-merging linux_os/guide/services/ssh/sshd_approved_ciphers.var

Packit command `packit prepare-sources [OPTIONS] [PATH_OR_URL]` was not provided with valid value for argument `PATH_OR_URL`. This happened while attempting to execute merge of `pr-changes/12949` branch.