Spiral Text problems

[Norah Belle]

I'm trying to use Spiral Text Extension in Inkscape. (Windows 8)

have installed extensions

and Hershey Text (successfully rendered text)

but get an error when trying to use spiral text

+======================================+

Traceback (most recent call last):

  File "eggbot_spiraltext.py", line 400, in <module>

    e.affect()

  File "C:\Program Files (x86)\Inkscape\share\extensions\inkex.py", line 268, in affect

    self.effect()

  File "eggbot_spiraltext.py", line 386, in effect

    height = float( inkex.unittouu( svg.attrib['height'] ) ) - h * scale_y

AttributeError: 'module' object has no attribute 'unittouu'

+======================================+

not sure how to fix this?

any suggestions?

thanks