game logic , physics consterients are not compiled by blender 2.45

hi ,
i am using Blender 2.45. and wanted to do some animation using BULLET . In the Game engine interface when trying to run the scripts of given exples.
They show some error like invalid module Game engine, Physics Consterients.
Can any body say what should i do so that i will able to run them in the Game interface itself.
thank u.

I don’t completely get the point, but here’s my answer:
Scripts don’t “run” in the game engine “interface”?!
They run in “real time/game mode”!
You must “attach” them to an object with a “python” controller.