UnicodeEncodeError: 'ascii' codec can't encode characters in position

[alazhar]

got this error when trying to list backup

retmux# retmux -v
retmux 1.0.3
retmux -l prod
Details of backup:prod
========================================================================
Traceback (most recent call last):
  File "/usr/local/bin/retmux", line 4, in <module>
    __import__('pkg_resources').run_script('retmux==1.0.0', 'retmux')
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 658, in run_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 1438, in run_script
    exec(code, namespace, namespace)
  File "/usr/local/lib/python2.7/dist-packages/retmux-1.0.0-py2.7.egg/EGG-INFO/scripts/retmux", line 92, in <module>
    func(sys.argv[2])
  File "/usr/local/lib/python2.7/dist-packages/retmux-1.0.0-py2.7.egg/tmuxbk/controller.py", line 89, in show_and_action
    print '\n'.join(tmux.long_info())
UnicodeEncodeError: 'ascii' codec can't encode characters in position 80-82: ordinal not in range(128)