TypeError, caused by Aperture Macro?

[senic35]

I'm experiencing a type error occurring while trying to parse gerber files which contain aperture macros.

You can find a reference to it here: (under 4.5 Aperture Macro (AM))
ucamco gerber specification

Here is the error that occurs in file \gerberex\am_expression.py", line 54, in to_gerber :

gerber = '%.6g' % self._value
                  │    └ 'Rectangle Pad at angle 45'
                  └ <gerberex.am_expression.AMConstantExpression object at 0x037F0BC8>
TypeError: must be real number, not str

The whole expression in my gerberfile that should create a rectangle with a side length of 0.05512 mils, placed at an 45 degree angle looks like this:

%AMT83*0 Rectangle Pad at angle 45*21,1,0.05512,0.05512,0,0,45*%

[senic35]

It seems like the 0 in the start marks a comment, which this library does not handle.