The PowerSchool Learning team has identified an issue where users experience an error on pages where rubrics are present. Our team is actively working on resolving this issue and will provide an update as soon as possible. Thank you for your patience.
You can follow the latest status updates here: https://status.powerschool.com/
I shared this update in a different thread as well, but also sharing it here:
A fix has been implemented and this issue is now resolved. If you experience any residual issues, please reach out to PowerSchool support. Thank you for your patience.