When using Visual Scheduler, if you get the following error on your section detail, perform the steps below to clear it.

While in PowerScheduler:

Functions > Calculate Target Number of Sections of Offer > Apply to: All courses in the active catalog

Functions > Reset Teacher Assignments
After clicking on this function, the screen will only refresh. No other action will be needed.
Functions > Auto Fill Course Information > Apply to: All courses in the active catalog > Set Frequency to 1 > Set Periods Per Meeting to 1 > Submit
