Gwt Spring integration problem

Hi Guys
I have problem with my starter application for integrating gwt and
spring framework.
Application is made up of simple button, when client push it, server
response trough popup box with string message .
This is server response:
The error is :
com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException:
Parameter 0 of is of an unknown type 'java.lang.String/2004016611

This is log file:

12-ott-2010 13.44.16 org.apache.catalina.core.ApplicationContext log
GRAVE: springGwtRemoteServiceServlet: An
IncompatibleRemoteServiceException was thrown while processing this
call.
com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException:
Parameter 0 of is of an unknown type 'java.lang.String/2004016611'
at com.google.gwt.user.server.rpc.RPC.decodeRequest(RPC.java:277)
at
org.spring4gwt.server.SpringGwtRemoteServiceServlet.processCall(SpringGwtRemoteServiceServlet.java:
32)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:
86)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:
303)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:
208)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:
243)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:
201)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:
163)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:
108)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:
556)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:
118)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:
401)
at
org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:
281)
at org.apache.coyote.http11.Http11AprProtocol
$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
at org.apache.tomcat.util.net.AprEndpoint
$SocketProcessor.run(AprEndpoint.java:1568)
at java.util.concurrent.ThreadPoolExecutor
$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor
$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassNotFoundException: java.lang.String/
2004016611
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at
com.google.gwt.user.server.rpc.RPC.getClassFromSerializedName(RPC.java:
657)
at com.google.gwt.user.server.rpc.RPC.decodeRequest(RPC.java:274)
... 19 more

Any Ideas?

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