Bursting status report exception, java.lang.NullPointerException

I need help with XML publisher Report Bursting Program, I have an exception:

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XML Publisher: Version : 12.0.0
Copyright (c) 1979, 1999, Oracle Corporation. All rights reserved.
XDOBURSTREP module: XML Publisher Report Bursting Program
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Current system time is 12-OCT-2011 15:52:32
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XML/BI Publisher Version : 5.6.3
Updating request description
Retrieving XML request information
Preparing parameters
Set Bursting parameters..
Bursting propertes.....
{user-variable:cp:territory=US, user-variable:cp:ReportRequestID=1507750, user-variable:cp:language=en, user-variable:cp:responsibility=50545, user-variable.OA_MEDIA=https://p2pintactglstage.oracleoutsourcing.com:443/OA_MEDIA, burstng-source=EBS, user-variable:cp:DebugFlag=Yes, user-variable:cp:parent_request_id=1507750, user-variable:cp:locale=en-US, user-variable:cp:user=OEB-ADSUPPORT, user-variable:cp:application_short_name=XDO, user-variable:cp:request_id=1507751, user-variable:cp:org_id=82, user-variable:cp:reportdescription=XXINT : List Of Active Users, user-variable:cp:Dummy for Data Security=N}