This error can occur if the reports have been removed/deleted from the reporting job contained within the task. To verify this, select the task that contains the failed reporting job underneath the Tasks node. Then select the Reporting job that has been setup within the task, and select the "Reporting" tab within the job. See if any reports are listed there. If no reports are listed there then this error will be returned.
To resolve this issue, add reports back to the reporting job:
1. Within the task select the Reporting job that has been setup, then select the Reporting tab of the job
2. Select the InTrust Server and the Reporting Library
3. Click the "Configure" button
4. Follow the wizard and select the desired reports to add to the job
