Comment 4 for bug 1646595

confirmed on Windows 10, Inkscape 0.92pre3 15195
I used the Gcodetools->Area extension and got the error message:

.......................................................

Cutting tool has not been defined! A default tool has been automatically added.

Traceback (most recent call last):

  File "gcodetools.py", line 6751, in <module>

    gcodetools.affect()

  File "C:\Program Files (x86)\Inkscape\share\extensions\inkex.py", line 283, in affect

    self.effect()

  File "gcodetools.py", line 6679, in effect

    self.area()

  File "gcodetools.py", line 4767, in area

    csp = cubicsuperpath.parsePath(d)

  File "C:\Program Files (x86)\Inkscape\share\extensions\cubicsuperpath.py", line 163, in parsePath

    return CubicSuperPath(simplepath.parsePath(d))

  File "C:\Program Files (x86)\Inkscape\share\extensions\simplepath.py", line 109, in parsePath

    raise Exception, 'Invalid path, no initial command.'

Exception: Invalid path, no initial command.