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It's going to be hard to diagnose, that version is almost 10 years old. It's possible it's a PHP version change, but it doesn't seem likely a host would change to 7.4 given that's also outdated and unsupported. You could try rolling PHP back to 7.1 or earlier as that's what was out around the same ...

A site running for years has now started to give the following error: Fatal error: Uncaught Error: Class 'ModuleOperations' not found in /data09/localdir/public_html/lib/autoloader.php:127 Stack trace: #0 [internal function]: cms_autoloader('ModuleOperation...') #1 /data09/localdir/public_html/lib/a...