By default, the print job limit is set to 75 print jobs. When a load is placed on the application it can hit the 75 print jobs and
cause the above error.
Report Objects stored in Sessions would be counted as a PrintJob.
Main reports would count as a PrintJob.
Subreports would each count as a PrintJob.
The print job limit is controlled by the following reg key:
HKEY_LOCAL_MACHINE\SOFTWARE\CRYSTAL DECISIONS\10.0\REPORT APPLICATION SERVER\SERVER\PrintJobLimit
You can try increasing this number to stop the error from happening.