Error when attempting to plot with AxiDraw

Now that the AxiDraw has arrived, I am attempting to plot the AxiDraw_First.svg example.  I have installed Inkscape 0.91 and have both the latest Eggbot and AxiDraw extensions installed.  I can control the AxiDraw (i.e. pen up and down and Get Firmware Version) using the AxiDraw extension tabbed window with no problem, so its not a connectivity issue.   This is the error I get:
=================================================================================
Traceback (most recent call last):
  File "axidraw.py", line 2047, in <module>
    e.affect()
  File "C:\Program Files\Inkscape\share\extensions\inkex.py", line 268, in affect
    self.effect()
  File "axidraw.py", line 253, in effect
    self.plotDocument()
  File "axidraw.py", line 487, in plotDocument
    if (not self.getDocProps()):
  File "axidraw.py", line 2037, in getDocProps
    self.svgHeight = plot_utils.getLengthInches( self, 'height' )
AttributeError: 'module' object has no attribute 'getLengthInches'
=================================================================================

According to the AxiDraw Control window, the AxiDraw extension is version 1.0.2 dated 2016-04-02.

Please advise. Thank you.

-craig