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Google app engineでUnavailableExceptionエラー

デプロイしてそのVersionで動作させようとすると下記のエラーが出た。今はデプロイできないの?

Uncaught exception from servlet
javax.servlet.UnavailableException: Initialization failed.
	at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.createHandler(AppVersionHandlerMap.java:199)
	at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.getHandler(AppVersionHandlerMap.java:167)
	at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:127)
	at com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:235)
	at com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:4823)
	at com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:4821)
	at com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest(BlockingApplicationHandler.java:24)
	at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:359)
	at com.google.net.rpc.impl.Server$2.run(Server.java:820)
	at com.google.tracing.LocalTraceSpanRunnable.run(LocalTraceSpanRunnable.java:56)
	at com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan(LocalTraceSpanBuilder.java:516)
	at com.google.net.rpc.impl.Server.startRpc(Server.java:775)
	at com.google.net.rpc.impl.Server.processRequest(Server.java:348)
	at com.google.net.rpc.impl.ServerConnection.messageReceived(ServerConnection.java:436)
	at com.google.net.rpc.impl.RpcConnection.parseMessages(RpcConnection.java:319)
	at com.google.net.rpc.impl.RpcConnection.dataReceived(RpcConnection.java:290)
	at com.google.net.async.Connection.handleReadEvent(Connection.java:428)
	at com.google.net.async.EventDispatcher.processNetworkEvents(EventDispatcher.java:762)
	at com.google.net.async.EventDispatcher.internalLoop(EventDispatcher.java:207)
	at com.google.net.async.EventDispatcher.loop(EventDispatcher.java:101)
	at com.google.net.rpc.RpcService.runUntilServerShutdown(RpcService.java:251)
	at com.google.apphosting.runtime.JavaRuntime$RpcRunnable.run(JavaRuntime.java:374)
	at java.lang.Thread.run(Unknown Source)

Unexpected exception from servlet: javax.servlet.UnavailableException: Initialization failed.