General errors can occur in many places throughout WHMCS, and can be due to many different problems. However, fixing them is often simple.
Troubleshoot and resolve 404 Not Found: The requested URL was not found on this server. errors.
Troubleshoot and resolve You are attempting to access the admin area via a directory that is not configured. errors.
Troubleshoot and resolve a blank Admin Dashboard after an update.
Troubleshoot and resolve blank or partially-rendered pages after an update.
Troubleshoot and resolve incorrect display of accented (Unicode) characters.
Troubleshoot and resolve The file is corrupted. errors.