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: 
Traceback (most recent call last):
  File "/usr/bin/dist-git-client", line 10, in <module>
    main()
    ~~~~^^
  File "/usr/lib/python3.13/site-packages/dist_git_client.py", line 494, in main
    srpm(args, config)
    ~~~~^^^^^^^^^^^^^^
  File "/usr/lib/python3.13/site-packages/dist_git_client.py", line 348, in srpm
    check_call(command)
    ~~~~~~~~~~^^^^^^^^^
  File "/usr/lib/python3.13/site-packages/dist_git_client.py", line 50, in check_call
    subprocess.check_call(cmd)
    ~~~~~~~~~~~~~~~~~~~~~^^^^^
  File "/usr/lib64/python3.13/subprocess.py", line 419, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['rpmbuild', '-bs', '/var/lib/copr-rpmbuild/results/python-APScheduler.spec', '--define', 'dist %nil', '--define', '_sourcedir /var/lib/copr-rpmbuild/workspace/workdir-1r884s0e/python-APScheduler/.', '--define', '_srcrpmdir /var/lib/copr-rpmbuild/results', '--define', '_disable_source_fetch 1']' returned non-zero exit status 1.

RPM build traceback, caused by the detected error but irrelevant for diagnosis.