Traceback (most recent call last):
  File "/usr/bin/pycentral", line 1387, in <module>
    main()
  File "/usr/bin/pycentral", line 1381, in main
    rv = action.run(global_options)
  File "/usr/bin/pycentral", line 892, in run
    self.options.exclude, byte_compile_default=True)
  File "/usr/bin/pycentral", line 675, in install
    self.default_runtime.byte_compile(self.private_files, bc_option,
AttributeError: 'NoneType' object has no attribute 'byte_compile'