Operations Center issue running custom reports

Does anyone have any information on running custom reports and getting either unknown exception error or invalid query responses for a custom report that worked once?

I randomly get these messages in 2 of my environments even though I have been able to run this report on multiple Operations Center databases ( I have 5 different ones). I have also run this report once successfully on the database where I randomly get these errors. My second database where i get these errors, the report has never run successfully and I have over 5 million tables here.

This is the report I am trying to run:

SELECT  B.friendlyName as 'Master Server Name',
(         select  DATEDIFF(DAY,UtcBigIntToNomTime(MAX(CKP.endTime)),GETDATE()) as 'Number of days since Last successful'
                    from   DBA.domain_JobArchive CKP
                    where CKP.masterServerId = A.masterServerId AND
                              CKP.clientId = A.clientId AND 
                              CKP.policyId = A.policyId AND
                              CKP.policyType = A.policyType AND
                              CKP.scheduleType = A.scheduleType AND
                              ( CKP.statusCode = 0 OR   CKP.statusCode = 1  )  ),
          A.clientName as 'Client Name',
          A.policyName as 'Policy Name',
          A.scheduleName as 'Schedule Name',
          UtcBigIntToNomTime(A.endTime) as 'Date of failure',
          A.statusCode as 'Status Code',
          (         select  UtcBigIntToNomTime(MAX(BKP.endTime)) as 'Last successful'
                    from   DBA.domain_JobArchive BKP
                    where BKP.masterServerId = A.masterServerId AND
                              BKP.clientId = A.clientId AND 
                              BKP.policyId = A.policyId AND
                              BKP.policyType = A.policyType AND
                              BKP.scheduleType = A.scheduleType AND
                             ( BKP.statusCode = 0 OR   BKP.statusCode = 1  ) )
FROM  "domain_JobArchive" A , "domain_masterserver" B
WHERE
          A.masterServerId = B.id AND
          DATEDIFF(hour,UtcBigIntToNomTime(A.endTime), GETDATE()) <= 120
          AND A.statusCode > 1 AND
(         select  DATEDIFF(DAY,UtcBigIntToNomTime(MAX(CKP.endTime)),GETDATE()) as 'Number of days since Last successful'
                    from   DBA.domain_JobArchive CKP
                    where CKP.masterServerId = A.masterServerId AND
                              CKP.clientId = A.clientId AND 
                              CKP.policyId = A.policyId AND
                              CKP.policyType = A.policyType AND
                              CKP.scheduleType = A.scheduleType AND
                              ( CKP.statusCode = 0 OR   CKP.statusCode = 1  )  ) > 0
ORDER BY B.friendlyName , 'Number of days since Last successful' ;