My website has been running successfully for around a year. Today for some reason it is not working...I get Class 'Cms5647206de9489_1493921822Class' not found error message. I have not done any systems updates or made any changes recently so wondered if anyone else has experienced this.

First try php artisan cache:clear then test your site. Next composer dump-autoload then test your site. Finally rename your vendor folder vendor.old and try composer install then test your site. If that still doesn't work you can try composer update. I have seen this error before, but locating the exact cause is difficult.

Thanks very much for your help, clearing the cache fixed the problem......