Blackbaud K-12 conducts routine maintenance during a weekly maintenance and testing window on Saturdays from 12:00AM - 6:00AM EST. If you are receiving this error when running reports during this time frame, this is likely the cause. 

If running the report outside of the weekly maintenance and testing time frame, it could be because the user does not have sufficient rights to run the report. 

1. As a Platform Manager select Analyze > Reports > Report Admin.
2. Locate the Report and select Role or Users.
3. If selecting Role, make sure that the user has a role that is included to run those reports.
4. If selecting User, add the user so that they have access to run the report.

If the user is still receiving the same error message, Contact  Support and reference this article. You can also check the status page at http://k12status.blackbaud.com for updates on any reported issues.