DV3D/VCS plot error

[chaosphere2112]

The demo at http://uvcdat.llnl.gov/examples/vcs3D_cubed_sphere_volume.html returns the following error:

In [27]: x.plot( v, dv3d, grid_file="vcs3D_cubed_sphere_volume_grid.nc" )
---------------------------------------------------------------------------
vcsError                                  Traceback (most recent call last)
<ipython-input-27-6a265f659a04> in <module>()
----> 1 x.plot( v, dv3d, grid_file="vcs3D_cubed_sphere_volume_grid.nc" )

/export/durack1/160302_pcmdi_metrics/PCMDI_METRICS/lib/python2.7/site-packages/vcs/Canvas.pyc in plot(self, *actual_args, **keyargs)
   2404         self.__last_plot_keyargs = keyargs
   2405         passed_var = keyargs.get("variable", None)
-> 2406         arglist = _determine_arg_list(None, actual_args)
   2407         if passed_var is not None:
   2408             arglist[0] = cdms2.asVariable(passed_var)

/export/durack1/160302_pcmdi_metrics/PCMDI_METRICS/lib/python2.7/site-packages/vcs/Canvas.pyc in _determine_arg_list(g_name, actual_args)
    222         else:
    223             raise vcsError("Unknown type %s of argument to plotting command." %
--> 224                            type(args[i]))
    225     if g_name is not None:
    226         arglist[igraphics_method] = g_name

vcsError: Unknown type <type 'NoneType'> of argument to plotting command.

Following version info:

[duro@ocean ~/160302_pcmdi_metrics]$ env | grep UVCDAT
UVCDAT_PROMPT_STRING=v2.5.0-81-gf4493d2
UVCDAT_SETUP_PATH=/export/durack1/160302_pcmdi_metrics/PCMDI_METRICS

@chaosphere2112 @mattben pinging you gentlemen here

Migrated from: https://github.com/UV-CDAT/uvcdat/issues/1867