DTS package fails to run when scheduled

DTS step 1 runs. Step 2: both DTS and stored runs OK directly, but fail as a scheduled job. Below is the text from the job history details.

Thanks in advance!!!

 DTSRun:  Executing...   DTSRun OnStart:  Create Table Results Step   DTSRun OnStart:  DTSStep_DTSExecuteSQLTask_1   DTSRun OnFinish:  Create Table Results Step   DTSRun OnFinish:  DTSStep_DTSExecuteSQLTask_1   DTSRun OnStart:  Copy Data from Results to Results Step   DTSRun OnStart:  DTSStep_DTSDataPumpTask_1   DTSRun OnError:  DTSStep_DTSDataPumpTask_1, Error = -2146959361 (8007FFFF)      Error string:  Catastrophic failure         Error source:  Microsoft Data Transformation Services (DTS) Package      Help file:  sqldts80.hlp      Help context:  4700      Error Detail Records:      Error:  -2146959361 (8007FFFF); Provider Error:  0 (0)      Error string:  Catastrophic failure         Error source:  Microsoft Data Transformation Services (DTS) Package      Help file:  sqldts80.hlp      Help context:  4700         Error:  -2146959361 (8007FFFF); Provider Error:  0 (0)      Error string:  Catastrophic failure         Error source:  Microsoft Data Transformatio...  Process Exit Code 2.  The step failed.