GWT 1.8 works fine until when upgraded to GWT 2

ROOT CAUSE       org.mortbay.thread.BoundedThreadPool$PoolThread.run
(BoundedThreadPool.java:442)
Caused by: java.lang.ClassNotFoundException:
com.efycaci.gwt.client.LoggedUser/857921908
        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)
        ... 29 more

SEVERE: [1260954843468000] javax.servlet.ServletContext log: An
IncompatibleRemoteServiceException was thrown while processing this
call.
com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException:
Parameter 0 of is of an unknown type
'com.efycaci.gwt.client.LoggedUser/857921908'
        at com.google.gwt.user.server.rpc.RPC.decodeRequest(RPC.java:277)
        at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall
(RemoteServiceServlet.java:163)
        at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost
(RemoteServiceServlet.java:86)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
487)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1093)
        at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter
(ServeBlobFilter.java:51)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
        at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter
(TransactionCleanupFilter.java:43)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
        at com.google.appengine.tools.development.StaticFileFilter.doFilter
(StaticFileFilter.java:121)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
        at org.mortbay.jetty.servlet.ServletHandler.handle
(ServletHandler.java:360)
        at org.mortbay.jetty.security.SecurityHandler.handle
(SecurityHandler.java:216)
        at org.mortbay.jetty.servlet.SessionHandler.handle
(SessionHandler.java:181)
        at org.mortbay.jetty.handler.ContextHandler.handle
(ContextHandler.java:712)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
405)
        at com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle
(DevAppEngineWebAppContext.java:70)
        at org.mortbay.jetty.handler.HandlerWrapper.handle
(HandlerWrapper.java:139)
        at com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.handle(JettyContainerService.java:352)
        at org.mortbay.jetty.handler.HandlerWrapper.handle
(HandlerWrapper.java:139)
        at org.mortbay.jetty.Server.handle(Server.java:313)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
506)
        at org.mortbay.jetty.HttpConnection$RequestHandler.content
(HttpConnection.java:844)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
        at org.mortbay.io.nio.SelectChannelEndPoint.run
(SelectChannelEndPoint.java:396)


^^^^^Parameter 0 of is of an unknown type
'com.efycaci.gwt.client.LoggedUser/857921908'

Has anybody faced this problem or Is there anybody who can help in
this?

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