java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.apache.tapestry.asset.AssetService.service(AssetService.java:227)
at undefined.$IEngineService_111482e1797.service($IEngineService_111482e1797.java)
at org.apache.tapestry.services.impl.EngineServiceOuterProxy.service(EngineServiceOuterProxy.java:72)
at org.apache.tapestry.engine.AbstractEngine.service(AbstractEngine.java:246)
at org.apache.tapestry.services.impl.InvokeEngineTerminator.service(InvokeEngineTerminator.java:54)

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