KM Startup Error

I've got EP6 SP2 Patch2 Hotfix4 running in a Windows environment (SQL Server backend). I have installed CM/Collaboration and TREX and the installs went ok, but when trying to access anything of KM via the Portal I get the following error:

Error during Knowledge Management startup!

java.lang.RuntimeException: Failed to init. connection pool configuration: Failed to init. connection pool configuration: missing plugin /cm/utilities/connection_pools

Can anyone help me out?

Thanks!

-eric