Plugin not working by me

When i go into settings i there isn’t CSS and i can’t change any setting.
There are many errors in the console:

?
/wp-content/plugins/…k-end.css?ver=4.9.4 Failed to load resource: the server responded with a status of 404 (Not Found)
jquery.form.js Failed to load resource: the server responded with a status of 404 (Not Found)
/wp-content/plugins/…ry-ui.css?ver=4.9.4 Failed to load resource: the server responded with a status of 404 (Not Found)
load-scripts.php:9 JQMIGRATE: Migrate is installed, version 1.4.1
back-end.js Failed to load resource: the server responded with a status of 404 (Not Found)
play-square-grey.png Failed to load resource: the server responded with a status of 404 (Not Found)
jquery.form.js Failed to load resource: the server responded with a status of 404 (Not Found)
play-square-blue.png Failed to load resource: the server responded with a status of 404 (Not Found)
back-end.js Failed to load resource: the server responded with a status of 404 (Not Found)
options-general.php:328 Uncaught ReferenceError: war_SoundyAdmin is not defined
    at options-general.php:328
pause-square-grey.png Failed to load resource: the server responded with a status of 404 (Not Found)
pause-square-blue.png Failed to load resource: the server responded with a status of 404 (Not Found)
/wp-content/plugins/…sic/audio/valse.mp3 Failed to load resource: the server responded with a status of 404 (Not Found)
style-back-end.css Failed to load resource: the server responded with a status of 404 (Not Found)
jquery-ui.css Failed to load resource: the server responded with a status of 404 (Not Found)

What Can I Do??