How to fix this error?
Here are the full logs:

java.lang.NoClassDefFoundError: Could not initialize class 
com.google.apphosting.runtime.security.shared.stub.sun.security.provider.Sun
        at java.io.ObjectStreamClass.hasStaticInitializer(Native Method)
        at 
java.io.ObjectStreamClass.computeDefaultSUID(ObjectStreamClass.java:1743)
        at java.io.ObjectStreamClass.access$100(ObjectStreamClass.java:72)
        at java.io.ObjectStreamClass$1.run(ObjectStreamClass.java:250)
        at java.io.ObjectStreamClass$1.run(ObjectStreamClass.java:248)
        at java.security.AccessController.doPrivileged(Native Method)
        at 
java.io.ObjectStreamClass.getSerialVersionUID(ObjectStreamClass.java:247)
        at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:613)
        at 
java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1746)
        at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1630)
        at 
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1907)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1462)
        at 
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2140)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2064)
        at 
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1936)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1462)
        at 
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2140)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2064)
        at 
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1936)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1462)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:417)
        at 
com.google.apphosting.utils.servlet.DeferredTaskServlet.readRequest(DeferredTaskServlet.java:218)
        at 
com.google.apphosting.utils.servlet.DeferredTaskServlet.performRequest(DeferredTaskServlet.java:142)
        at 
com.google.apphosting.utils.servlet.DeferredTaskServlet.service(DeferredTaskServlet.java:101)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at 
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
        at 
com.googlecode.objectify.ObjectifyFilter.doFilter(ObjectifyFilter.java:48)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at 
com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:125)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at 
com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:37)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at 
com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:60)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at 
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:50)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at 
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
        at 
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at 
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
        at 
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
        at 
com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:260)
        at 
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
        at org.mortbay.jetty.Server.handle(Server.java:326)
        at 
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
        at 
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
        at 
com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:78)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
        at 
com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:148)
        at 
com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:468)
        at 
com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:439)
        at 
com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:446)
        at 
com.google.tracing.CurrentContext.runInContext(CurrentContext.java:256)
        at 
com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:310)
        at 
com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:302)
        at 
com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:443)
        at 
com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:235)
        at java.lang.Thread.run(Thread.java:745)

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