Hello.
Nothing on server side that would indicate a server/php error.
So far, it seems that this is client-facing error.
What I have seen from browser end(not a JS developer):
Javascript engine shows that “.success” is not a valid function and crashes.
However, the XHR is triggered, receives a reply from server, but doesn’t know what to do with reply, as “.success” callback is not available.
Another place where this error is present – Category mapping section.
JS screams that “.success” is not a valid function.
XHR is processed, Google categories are received by browser from server.
JS fails to populate the autocomplete category mappings.
Might be something to do with this?
(source : https://api.jquery.com/jquery.ajax/)
“Deprecation Notice: The jqXHR.success(), jqXHR.error(), and jqXHR.complete() callbacks are removed as of jQuery 3.0. You can use jqXHR.done(), jqXHR.fail(), and jqXHR.always() instead.”