Get failed to load... when editing forms

I keep getting the following message at random times when editing forms... what do I need to do?

Failed to load plugin: jotformuploadx3 from url https://cdn.jotfor.ms/js/tinymce-4.5.2/plugins/jotformuploadx3/plugin.min.js

Hi,

Could you please share the form link so we can check it? Also, may we know what section of the form we need to edit so we can try and replicate the issue?

I also cleared your form cache on our server. Please check the form again and let us know if the issue still persists. We'll wait for your response. Thank you!