Can't load agpgart module

[Bas van der Peet <bas.vanderpeet@chello.be>]

When trying to load the agpgart module insmod gives the following error 
message:
"couldn't find the kernel version the module was compiled for"

I'm running testing with a 2.4.2 kernel

Any help on how to fix this or pointers to documentation would be 
appreciated.

Thanks, Bas