Sign-up auto groups not working as expected, console errors

Open the browser console Add several students to a site Add the Signup tool to the site Click Signup and create a new future meeting Set the time limit for 1 hour Set Sign-up Begins "now" Set Sign-up Ends "1 hour before meeting finishes" Click Next Click "Show the other default settings" Select "Yes, create a group for each timeslot that can be managed via Site Info > Manage Groups" and Publish Either have a student login and signup or click Add Participant and select a student Click on Site Info -> Manage Groups: you should see 4 groups Expected behavior: student just added should display for that group Add a different student to another one of the sign-up groups by clicking the group link and then adding the student Click on Signup -> meeting link Click on Synchronize to group for the first student that was signed up Expected behavior: there should be no change and no console error Click on Synchronize from group beside the time slot for the student added to the group in step 13 Expected behavior: student name should display for the time slot and no console error