0k on linux problem

grzes@winry:~$ rapid pin zk:stable
Using data directory: /home/grzes/.spring
Pinning: zk:stable
Installing: Zero-K v0.9.9.2
Traceback (most recent call last):
  File "/usr/local/bin/rapid", line 5, in <module>
    pkg_resources.run_script('rapid-spring==0.5.1', 'rapid')
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 467, in run_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 1200, in run_script
    execfile(script_filename, namespace, namespace)
  File "/usr/local/lib/python2.7/dist-packages/rapid_spring-0.5.1-py2.7.egg/EGG-INFO/scripts/rapid", line 7, in <module>
    main()
  File "/usr/local/lib/python2.7/dist-packages/rapid_spring-0.5.1-py2.7.egg/rapid/ui/text/main.py", line 131, in main
    pin(req_arg())
  File "/usr/local/lib/python2.7/dist-packages/rapid_spring-0.5.1-py2.7.egg/rapid/main.py", line 42, in pin
    install_single(rapid.packages[t])
  File "/usr/local/lib/python2.7/dist-packages/rapid_spring-0.5.1-py2.7.egg/rapid/main.py", line 68, in install_single
    p.install(ProgressBar())
  File "/usr/local/lib/python2.7/dist-packages/rapid_spring-0.5.1-py2.7.egg/rapid/rapid.py", line 539, in install
    self.download_files(self.missing_files, progress)
  File "/usr/local/lib/python2.7/dist-packages/rapid_spring-0.5.1-py2.7.egg/rapid/rapid.py", line 489, in download_files
    postdata = gzip_string(bits.tostring())
  File "/usr/local/lib/python2.7/dist-packages/bitarray-0.5.0-py2.7-linux-x86_64.egg/bitarray/__init__.py", line 91, in tostring
    return self.tobytes().decode()
UnicodeDecodeError: 'ascii' codec can't decode byte 0xff in position 0: ordinal not in range(128)