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: 
  File "/builddir/build/BUILD/python-twisted-24.11.0-build/twisted-twisted-24.11.0/src/twisted/conch/test/test_cftp.py", line 212, in ListingTests
    locale.setlocale(locale.LC_ALL, currentLocale)
  File "/usr/lib64/python3.13/locale.py", line 615, in setlocale
    return _setlocale(category, locale)
locale.Error: unsupported locale setting
Test is trying to set a locale to a `locale.LC_ALL`, but that locale setting that is attempted is not supported in the default mock environment.