oracle.webdb.utils.PortalExceptionImpl: An error occurred whilst invoking an operation on the Provider

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Error generating file "../../javacache/admin/javacache.xml"

java.rmi.RemoteException: Runtime exception; nested exception is:
XML parsing error: com.sun.xml.rpc.sp.ParseException:1: Document root element is missing	at com.sun.xml.rpc.client.StreamingSender._handleRuntimeExceptionInSend(StreamingSender.java:269)	at com.sun.xml.rpc.client.StreamingSender._send(StreamingSender.java:251)	at oracle.webdb.wsrp.WSRP_v1_Markup_PortType_Stub.getMarkup(WSRP_v1_Markup_PortType_Stub.java:205)	at oracle.webdb.wsrp.client.run.WSRPRenderDispatcher.dispatch(Unknown Source)	at oracle.webdb.wsrp.client.run.WSRPDispatcher.dispatch(Unknown Source)	at oracle.webdb.wsrp.client.run.WSRPCacheDispatcher.dispatch(Unknown Source)	at oracle.webdb.wsrp.client.run.WSRPMainDispatcher.dispatch(Unknown Source)	at oracle.webdb.page.ContentFetcher.run(Unknown Source)