could not determine namespace bound to element prefix stream

What that mean & how can fix ?

2016.02.22 10:07:10 org.jivesoftware.openfire.server.ServerDialback[Acting as Originating Server: Create Outgoing Session from: xxxxx.biz to RS at: jwchat.or

g (port: 5269)] - An exception occurred while creating outgoing session to remote server:

org.xmlpull.v1.XmlPullParserException: could not determine namespace bound to element prefix stream (position: START_DOCUMENT seen <stream:error>... @1:14)

        at org.xmlpull.mxp1.MXParser.parseStartTag(MXParser.java:1816)

        at org.xmlpull.mxp1.MXParser.parseProlog(MXParser.java:1479)

        at org.jivesoftware.openfire.net.MXParser.nextImpl(MXParser.java:341)

        at org.xmlpull.mxp1.MXParser.next(MXParser.java:1093)

        at org.jivesoftware.openfire.server.ServerDialback.createOutgoingSession(ServerDia lback.java:253)

        at org.jivesoftware.openfire.session.LocalOutgoingServerSession.createOutgoingSess ion(LocalOutgoingServerSession.java:373)

        at org.jivesoftware.openfire.session.LocalOutgoingServerSession.authenticateDomain (LocalOutgoingServerSession.java:210)

        at org.jivesoftware.openfire.server.OutgoingSessionPromise$PacketsProcessor.sendPa cket(OutgoingSessionPromise.java:266)

        at org.jivesoftware.openfire.server.OutgoingSessionPromise$PacketsProcessor.run(Ou tgoingSessionPromise.java:243)

        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

        at java.lang.Thread.run(Thread.java:745)

Centos 6.7  + openfire 4.0.1 

As result all roster looking as offline

HDD space not full , inode limit good too

nothing interesting on /var/log/messages

On debian working  good , but cant use user export/import plugin  for transfer

When try import fresh .xml got error "The import file does not match the user schema."

Can provide any log

Will apreciate for help

Thanks