JS error CKEditorError: plugincollection-plugin-not-found {"plugin":null}

Hi Sathish

Please provide screenshot of dev console content above that error. The information about which plugin cannot be loaded is logged before the error itself.

I got the same error.
In my case, the cause is that js files are blocked by Content Security Policy of seckit module.
Therefore adding 'https://cdn.ckeditor.com/' to script-src in seckit settings, it was solved.