Traceback (most recent call last):


 "test.py", line 2, in <module>

import xarray


 "/Users/huziy/anaconda/envs/py3.6/lib/python3.6/site-packages/xarray/__init__.py", line 10, in <module>

from .core.extensions import (register_dataarray_accessor,


 "/Users/huziy/anaconda/envs/py3.6/lib/python3.6/site-packages/xarray/core/extensions.py", line 7, in <module>

from .dataarray import DataArray


 "/Users/huziy/anaconda/envs/py3.6/lib/python3.6/site-packages/xarray/core/dataarray.py", line 10, in <module>

from ..plot.plot import _PlotMethods


 "/Users/huziy/anaconda/envs/py3.6/lib/python3.6/site-packages/xarray/plot/__init__.py", line 4, in <module>

from .plot import (plot, line, contourf, contour,


 "/Users/huziy/anaconda/envs/py3.6/lib/python3.6/site-packages/xarray/plot/plot.py", line 555, in <module>

@_plot2d


 "/Users/huziy/anaconda/envs/py3.6/lib/python3.6/site-packages/xarray/plot/plot.py", line 404, in _plot2d

plotfunc.__doc__ = '\n'.join((plotfunc.__doc__, commondoc))
TypeError: sequence item 0: expected str instance, NoneType found

Traceback (most recent call last):


 "/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 162, in _run_module_as_main

"__main__", fname, loader, pkg_name)


 "/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 72, in _run_code

exec code in run_globals


 "/usr/local/lib/python2.7/site-packages/bCNC/__main__.py", line 2708, in <module>

main()


 "/usr/local/lib/python2.7/site-packages/bCNC/__main__.py", line 2676, in main

application = Application(tk)


 "/usr/local/lib/python2.7/site-packages/bCNC/__main__.py", line 196, in __init__

page = cls(self.ribbon, self)


 "/usr/local/lib/python2.7/site-packages/bCNC/CNCRibbon.py", line 115, in __init__

self.register()


 "/usr/local/lib/python2.7/site-packages/bCNC/
Page.py", line 395, in register

(SerialFrame,))


 "/usr/local/lib/python2.7/site-packages/bCNC/CNCRibbon.py", line 134, in _register

w = f(self.master._pageFrame, self.app)


 "/usr/local/lib/python2.7/site-packages/bCNC/
Page.py", line 253, in __init__

self.comportRefresh()


 "/usr/local/lib/python2.7/site-packages/bCNC/
Page.py", line 351, in comportRefresh

hwgrep += ["hwgrep://"+hw+"\t"+i[1]]
TypeError: cannot concatenate 'str' and 'NoneType' objects
