Plugin Failure "Reen, Reen, BUMP!"

Hello!
I’m having this error.
I downloaded a plugin called “N-Media Website Contact Form with File Upload”
But I didn’t see that it was not tested with my version of wordpress.

Now my whole site is shut down and I can’t do anything, when I go to my website https://cgraenge.dk – it just says “Reen, Reen, BUMP! not found /home/c/g/ftp_cgraengedk/wp-content/plugins/website-contact-form-with-file-upload/classes/input.class.php”

I need all the help I can!

– Christian Graenge – https://www.cgraenge.dk