Trouble with WSRP portlets

Problem: at one moment all deployed WSRP portlets was crushes.
The following error shows in portlet window: Error: Could not get markup. The cookie or session is invalid or there is a runtime exception
Remote debugging shows, what portlets really works, but Portal server can't get markup after portlet was executed.
And similar following exceptions I has found in portal's application.log:
06/06/20 15:16:44 portal: DEBUG: active=26 id=91794728298,1 Content Fetcher Caught Dispatcher Exception :
oracle.webdb.utils.PortalExceptionImpl: An error occurred whilst invoking an operation on the Provider
     at oracle.portal.PortalException.<init>(Unknown Source)
     at oracle.webdb.dispatcher.DispatcherException.<init>(Unknown Source)
     at oracle.webdb.wsrp.client.run.WSRPDispatcherException.<init>(Unknown Source)
     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)
Caused by: 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)
     ... 5 more
Caused by: XML parsing error: com.sun.xml.rpc.sp.ParseException:1: Document root element is missing
     at com.sun.xml.rpc.streaming.XMLReaderImpl.next(XMLReaderImpl.java:110)
     at com.sun.xml.rpc.streaming.XMLReaderBase.nextContent(XMLReaderBase.java:23)
     at com.sun.xml.rpc.streaming.XMLReaderBase.nextElementContent(XMLReaderBase.java:41)
     at com.sun.xml.rpc.client.StreamingSender._send(StreamingSender.java:116)
     ... 6 more
caused by: 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)
Caused by: XML parsing error: com.sun.xml.rpc.sp.ParseException:1: Document root element is missing
     at com.sun.xml.rpc.streaming.XMLReaderImpl.next(XMLReaderImpl.java:110)
     at com.sun.xml.rpc.streaming.XMLReaderBase.nextContent(XMLReaderBase.java:23)
     at com.sun.xml.rpc.streaming.XMLReaderBase.nextElementContent(XMLReaderBase.java:41)
     at com.sun.xml.rpc.client.StreamingSender._send(StreamingSender.java:116)
     ... 6 more
Need help to solve this problem.
P.S. Sorry for bad english.
Message was edited by:
Yarrow

Oracle Portal version 10.1.4

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