I have a client who was recently upgraded from 5.7 to 8.5.1 and has a number of errors:

1 - Exception Occurred: /home/titania/public_html/updates/concrete5-8.5.1/concrete/vendor/tedivm/stash/src/Stash/Driver/FileSystem.php:326 unlink(/home/titania/public_html/application/files/cache/overrides/1952a01898073d1e/561b9b4f2e42cbd7/38a865804f8fdcb6/57cd99682e939275/5bf1049cd739beee/4aacc6bae7b683eb.php): No such file or directory (2)

2 - Failed to generate or locate the thumbnail for file "2776"

3 - Exception Occurred: /home/titania/public_html/updates/concrete5-8.5.1/concrete/vendor/pagerfanta/pagerfanta/src/Pagerfanta/Pagerfanta.php:277 Page "2" does not exist. The currentPage must be inferior to "1" (0)

Does anyone know how to fix these ones please?

Thanks!