If youre getting this error while trying to run ruby script, just replace the loop in Packages/Default/exec.py on line 44 with the snippet below:

UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 60 ...

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for k, v in proc_env.iteritems():
  path_vars = os.path.expandvars(v)
  if isinstance(path_vars, unicode):
      path_vars = path_vars.encode(sys.getfilesystemencoding())
  proc_env[k] = path_vars