Unable to edit the event page of Eastern Michigan website page

Hello, when I go to save my edits on the events page here: https://centralusa.salvationarmy.org/emi/events/the-salvation-army-to-demonstrate-amateur-radio-emergency-capabilities, a box pops up that says “ERROR: Sorry! We are working on some permission issues. This will load correctly, shortly.” But it doesn’t update. Can you please let me know the issue? Thank you!