After my installation of 5.7.5.9 I´m unable to open my System & Settings. It only shows this message.

"include(/storage/content/87/118187/kompetensvy.se/public_html/concrete/vendor/composer/../mobiledetect/mobiledetectlib/Mobile_Detect.php): failed to open stream: No such file or directory"

Any suggestions what can be the problem? I can see the file where it supposed to be, and the directory has full rights.
/Peter