L system Troubles

I am having trouble getting Lsystem to run. I can get the script to to create a GUI and to load premade .DEF files, but I can’t get it to generate trees. When I press the generate button, I get : Error, check the python console, and then the GUI goes away, and I’m left with the original application.py that was there to start. Nothing is highlighted to suggest an error in coding.

When looking at the blender ms-dos console, I get:

AttributeError: ‘module’ object has no attribute ‘Const’

Can anybody help me with this?

Have you got this version?

http://jmsoler.free.fr/util/blenderfile/images/lsystem/neo_lstseed228.zip

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Thanks it works now.

I had seen that file when I was searching for a solution to my problem a couple of days ago, but then I forgot to go back and get it.