encodedRequest cannot be empty

I just updated my app from 2.0.4 to 2.1.1. Now I am intermittently
seeing the following error:

Exception while dispatching incoming RPC call
java.lang.IllegalArgumentException: encodedRequest cannot be empty
at com.google.gwt.user.server.rpc.RPC.decodedRequest(RPC.java:228)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:
205)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:
243)
at
com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:
62)

The error seems to come and go. Never saw it until I upgraded. Has
anyone seen this before? Any ideas how to fix it?

-TJ

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