Kernel 2.6 test8 errors

Tue Oct 28 01:57:25 UTC 2003

I am trying to get the test 8 version of the kernel to work properly and
give me a bootup without errors. I keep on getting this error

modprobe: FATAL: Module serial not found. 

Can someone knowledgeable please tell me how to get rid of that error
message. I am keeping the other kernel (2.4) just in case, so whatever I
do here must be compatible with the 2.4 series I have.

Help please anyone?