MAP Accelerator Placements

I was able to set the placements for 4 out of 5 of my classes in MAP Accelerator.  However, when I attempted to set the placements for my 7th hour, an error message popped up, "Oops, we weren't able to update the placement for these students.  Please try again."  I tried refreshing, logging out and back in, and tried to set 1 student's placement at a time.  The same error message continued to pop up.  

Can anyone help troubleshoot, please?  Thank you!