Kernel mismatch

I have a Digi Neo 1 port, and Im using Red Hat 9.
When I have installed the driver, and trys to start it, I get the following message:

/etc/rc.d/init.d/dgnc start

/lib/modules/2.4.22/misc/dgnc.o: kernel-module version mismatch
/lib/modules/2.4.22/misc/dgnc.o was compiled for kernel version 2.4.20-8 while this kernel is version 2.4.22.

What can i do?

These types of errors typically indicate a kernel/kernel-source/kernel-header mis-match. The following knowledge base article should be useful:

http://www.digi.com/support/kbaseresultdetl.jsp?id=317

If this article does not resolve these errors, it is recommeded that you contact you Linux support resource for assistance.