If you have a new version of blender that scripts is not compatible.
What OS you running blender on?
The python import export etc .py need updating to run in new blender if anyone can do that it would be good
In the mean time there is wzmit a viewer and obj to pie converter you can export your model in object format (.obj) and then convert to pie 3 in wzmit.
Also there is obj2pie.c in the warzone repo you can use that to convert obj to pie but you will need to compile that in your OS if it is linux there is a compiled version in wzgm repo for windows.
http://wzgraphicmods.svn.sourceforge.ne ... onversion/
The folder are one for windows obj2pie-win/ this has a python user interface or you can just used the pre compiled from terminal. there is a readme file
The folder for linux obj2pie/ there is a ubuntu pre compiled obj2pie or the .c file you can compile yourself also it has a python user interface good luck.