jquery-ui.css create 404

Hello,

the file /shortcode-menu/css/jquery-ui.css create 404 errors, it refers to images that do not exist :

ui-bg_flat_75_ffffff_40x100.png
ui-bg_highlight-soft_75_cccccc_1x100.png
ui-bg_glass_75_e6e6e6_1x400.png
ui-bg_glass_65_ffffff_1x400.png
….

https://wordpress.org/plugins/shortcode-menu/