Exception while dispatching incoming RPC call

I have an app that works perfectly in my development environment of eclipse/jetty. It also work fine when I deploy it locally to tomcat 7 on my development machine. But it fails on my production server with the following error,

...
SEVERE: Exception while dispatching incoming RPC call
at com.google.gwt.user.server.

rpc.RPC.encodeResponseForFailure(RPC.java:389)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:579)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:561)
SEVERE: Exception while dispatching incoming RPC call
at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:389)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:579)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:561)
SEVERE: Exception while dispatching incoming RPC call
at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:389)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:579)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:561)

...

Help!

Thanks!

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