SerializationException: No ClientOracle for permutation

I got this error while deploying DynaTable on tomcat 6.0.20 service,
help?

Dec 25, 2009 9:33:12 PM org.apache.catalina.core.ApplicationContext
log
SEVERE: Exception while dispatching incoming RPC call
com.google.gwt.user.client.rpc.SerializationException: No ClientOracle
for permutation 9FAA74222FC529174F6E496673194949
at com.google.gwt.user.server.rpc.HybridServiceServlet.processCall
(HybridServiceServlet.java:108)
at com.google.gwt.rpc.server.RpcServlet.processPost(RpcServlet.java:
203)
at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost
(AbstractRemoteServiceServlet.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke
(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke
(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke
(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke
(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke
(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service
(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11AprProcessor.process
(Http11AprProcessor.java:859)
at org.apache.coyote.http11.Http11AprProtocol
$Http11ConnectionHandler.process(Http11AprProtocol.java:574)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:
1527)
at java.lang.Thread.run(Unknown Source)

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