UnsupportedPluginTypeException: Coordinate frame barycentricmeanecliptic not in allowed values

[white3]

I am first time to use the tf_unet, then I try the demo of demo_radio_data.ipynb. When I was running code:
seek --file-prefix='/home/sgwhua/workspace/tf_unet-master/demo/bgs_example_data' --post-processing-prefix='/home/sgwhua/workspace/tf_unet-master/demo/bgs_example_data/seek_cache' --chi-1=20 --overwrite=True seek.config.process_survey_fft , I got this error: Coordinate frame barycentricmeanecliptic not in allowed values ['altaz', 'barycentrictrueecliptic', ...

Traceback (most recent call last):
  File "/home/sgwhua/.local/bin/seek", line 11, in <module>
    load_entry_point('seek==0.1.0', 'console_scripts', 'seek')()
  File "/home/sgwhua/.local/lib/python2.7/site-packages/ivy-0.1.0-py2.7.egg/ivy/cli/main.py", line 28, in run
    _main(*sys.argv[1:])
  File "/home/sgwhua/.local/lib/python2.7/site-packages/ivy-0.1.0-py2.7.egg/ivy/cli/main.py", line 37, in _main
    mgr.launch()
  File "/home/sgwhua/.local/lib/python2.7/site-packages/ivy-0.1.0-py2.7.egg/ivy/workflow_manager.py", line 107, in launch
    executor.run(ctx().params.plugins)
  File "/home/sgwhua/.local/lib/python2.7/site-packages/ivy-0.1.0-py2.7.egg/ivy/backend.py", line 48, in run
    return map(LoopWrapper(loop), mapPlugin.getWorkload())
  File "/home/sgwhua/.local/lib/python2.7/site-packages/ivy-0.1.0-py2.7.egg/ivy/backend.py", line 126, in __call__
    for plugin in self.loop:
  File "/home/sgwhua/.local/lib/python2.7/site-packages/ivy-0.1.0-py2.7.egg/ivy/loop.py", line 95, in next
    return self._instantiate(plugin)
  File "/home/sgwhua/.local/lib/python2.7/site-packages/ivy-0.1.0-py2.7.egg/ivy/loop.py", line 136, in _instantiate
    return PluginFactory.createInstance(pluginName, self.ctx)
  File "/home/sgwhua/.local/lib/python2.7/site-packages/ivy-0.1.0-py2.7.egg/ivy/plugin/plugin_factory.py", line 61, in createInstance
    raise UnsupportedPluginTypeException("Module '%s' could not be instantiated'" % pluginName, ex)
ivy.exceptions.exceptions.UnsupportedPluginTypeException: (u"Module 'seek.plugins.initialize' could not be instantiated'", ValueError(u"Coordinate frame barycentricmeanecliptic not in allowed values ['altaz', 'barycentrictrueecliptic', 'cirs', 'fk4', 'fk4noeterms', 'fk5', 'galactic', 'galacticlsr', 'galactocentric', 'gcrs', 'geocentrictrueecliptic', 'hcrs', 'heliocentrictrueecliptic', 'icrs', 'itrs', 'lsr', 'precessedgeocentric', 'supergalactic']",))