For those of you who made an app in the past 10 days or so (first half of March 2021), there is a bug in the admin portal that doesn’t affect the functionality of the page, but which throws a browser console error. Sorry about this error - it slipped by when making some last-minute updates prompted by a more urgent bug a couple of weeks ago.
To resolve this error, delete the “Checkforextension A” element in the admin_portal_canvas_logic reusable element. Note that this element can only be selected via the sidebar on the left, NOT through the element dropdown at the top of the editor:
After deleting the element, the error will no longer occur.
If you have any questions about this issue, please post in the thread below.