Since updating to WP5, having the follow JQ error and can't open the classic editor on the back end at all. I can see the Text tab, but not the Visual, and the Frontend Editor is a complete mess. I've deactivated plugins, updated the theme... the error remains (as below). Thank you for any assistance you can provide, as we need to get our landing page updated and it's pretty much unusable the way it is:

[Error] Did not parse stylesheet at 'https://swanabc.org/wp-content/themes/salient/nectar/tinymce/shortcode_generator/css/chosen/chosen.css?ver=8.0.1' because non CSS MIME types are not allowed in strict mode. [Error] Did not parse stylesheet at 'https://swanabc.org/wp-content/themes/salient/nectar/tinymce/shortcode_generator/css/tinymce.css?ver=5.0.3' because non CSS MIME types are not allowed in strict mode. [Error] Did not parse stylesheet at 'https://swanabc.org/wp-content/themes/salient/nectar/tinymce/shortcode_generator/css/magnific-popup.css?ver=5.0.3' because non CSS MIME types are not allowed in strict mode. [Log] JQMIGRATE: Migrate is installed, version 1.4.1 (load-scripts.php, line 9) [Error] SyntaxError: Unexpected token '<'     (anonymous function) [Error] SyntaxError: Unexpected token '<'     (anonymous function) [Error] SyntaxError: Unexpected token '<'     (anonymous function) [Error] TypeError: undefined is not an object (evaluating 'wp.shortcode.replace')     wrapData (backend.min.js:4597)     fetch (backend.min.js:4628:85)     findAll (backend.min.js:4448)     sync (backend.min.js:4723)     fetch (backbone.min.js:1:12323)     (anonymous function) (backend.min.js:5417)     (anonymous function) (load-scripts.php:362:8235)

:)  I already did that. Updated everything.