WEBI Java Error when starting report form the portal

Hi when i'm starting a BO WEBI report out from the portal the next error is apearing:

error on set doc title.

Details: Version:12.1.0.882

Toepassingsserver:

http://pcl09009.magma-it.local:8080/AnalyticalReporting/Webi/cdzServlet

Stapeltracering: netscape.javascript.JSException: Unspecified error invoking method or accessing property "updateDocumentTitle" at sun.plugin2.main.client.MessagePassingJSObject.newJSException(Unknown Source) at sun.plugin2.main.client.MessagePassingJSObject.waitForReply(Unknown Source) at sun.plugin2.main.client.MessagePassingJSObject.call(Unknown Source) at com.businessobjects.wp.tc.TCDocument.setNameEx(Unknown Source) at com.businessobjects.wp.om.OMDocument.setXmlProperty(Unknown Source) at com.businessobjects.wp.om.OMDocPropHandler.setDocProperty(Unknown Source) at com.businessobjects.wp.xml.XMLDocPropParser.parseDocProp(Unknown Source) at com.businessobjects.wp.xml.XMLDocPropParser.parseDocProps(Unknown Source) at com.businessobjects.wp.xml.XMLOutputParser.parseOutput(Unknown Source) at com.businessobjects.wp.xml.XMLOutputParser.parseOutputs(Unknown Source) at com.businessobjects.wp.xml.XMLOutputParser.parse(Unknown Source) at com.businessobjects.wp.xml.XMLLoader.loadDoc(Unknown Source) at com.businessobjects.wp.tc.TCMain.loadDocument(Unknown Source) at com.businessobjects.wp.tc.TCMain.initDocument(Unknown Source) at com.businessobjects.wp.tc.TCMain.initClient2(Unknown Source) at com.businessobjects.wp.tc.TCMain.initClient(Unknown Source) at com.businessobjects.wp.tc.thread.InitAppletRunner.run(Unknown Source) at java.lang.Thread.run(Unknown Source)

afte closing i can't refresh or change the querie

Does any one have solution for this? I'm using BO XI 3.1