This is not a problem with a missing HomePage.wsp file. The reference to the file is in the repository and the file is where it should be on the server under ../RM1/root.
I tracked the missing class, CDSConfigContainer, to the clientservlet.jar file. That file is identical on all 3 servers. I even copied the file from a working server in case there was something wrong with it, which didn't help.
I tried adding this jar file to the RaFramework CLASSPATH is various places, which didn't help.
I reinstalled and reconfigured Framework Services and Reporting and Analysis Services. This didn't help, either.
There is something subtly different about this one server. Does anyone have any idea what could possibly be wrong? Or where to look next?