Unexpected server error trying to use SEPM

Hello

This was working fine now all of a sudden stopped working. When I try to use the SEPM (version 12 installed on Win Svr 2012) I get 'unexpected server error'. If I try to access the web console, I get this: 

HTTP Status 404 - /console/apps/sepm

type Status report

message /console/apps/sepm

description The requested resource is not available.

Apache Tomcat/7.0.32

Logs attached.

Please help.

James