Reason of ERR_DEQUEUE_EVENT error message in Pipeline Rating

When start the pipeline rating, when pipe try to dequeue sends the next error:
15.01.2013 17:59:32 cvbrmdevnv   ifw          IFW       NORMAL   [T:31] 00092 - (ifw.Pipelines.TL_Mediation) INF_PIPELINE_START | The pipeline 'ifw.Pipelines.TL_Mediation' is started (active).
15.01.2013 17:59:32 cvbrmdevnv   ifw          IFW       NORMAL   [T:34] 00092 - (ifw.Pipelines.Rating) INF_PIPELINE_START | The pipeline 'ifw.Pipelines.Rating' is started (active).
15.01.2013 17:59:32 cvbrmdevnv   ifw          IFW       NORMAL   [T:37] 00092 - (ifw.Pipelines.PreRecycle) INF_PIPELINE_START | The pipeline 'ifw.Pipelines.PreRecycle' is started (active).
15.01.2013 18:00:24 cvbrmdevnv   ifw          IFW       MAJOR    [T:7] 31006 - (ifw.DataPool.Listener.Module.Thread_RecycleRequest_1) ERR_DEQUEUE_EVENT | Dequeue event exception ('[SERVERERROR] ORA-01013: user requested cancel of current operation