Forum Post: RE: AX 2012, SSRS error: There was an error while trying to deserialize parameter http://tempuri.org/:queryBuilderArgs

This happens quite frequently when AOS serving the reporting server crashes .Faced this several times.The way out for this is kill the AOS process (serving reports). Delete the Records in SysClientSessions for this AOS from database. Now  start the AOS service . Its good to use.