Also, another small issue:
Some jQuery UI theme images are not included in the plugin css file, so these return a 404 error when they cannot be found by WordPress to load.
ui-bg_flat_75_ffffff_40x100.png:1 Failed to load resource: net::ERR_FILE_NOT_FOUND
ui-bg_glass_75_e6e6e6_1x400.png:1 Failed to load resource: net::ERR_FILE_NOT_FOUND
ui-bg_glass_65_ffffff_1x400.png:1 Failed to load resource: net::ERR_FILE_NOT_FOUND
This issue is because old jQuery code is deprecated, and is being removed from WordPress, and plugins need updated to accommodate this change.
As a temporary solution to this issue, until the plugin code can be updated to work with modern versions, you can include the script – https://code.jquery.com/jquery-migrate-1.4.1.min.js – by using WP enqueuing in your theme’s functions.php file. Or, what may be easier for many, is to simply install the jQuery Migrate Helper plugin – https://ww.wp.xz.cn/plugins/enable-jquery-migrate-helper/
