General TroubleshootingGeneral errors can occur in many places throughout WHMCS, and can be due to many different problems. However, fixing them is often simple.
404 Page Not Found ErrorsTroubleshoot and resolve 404 Not Found: The requested URL was not found on this server. errors.
Admin Directory ErrorsTroubleshoot and resolve You are attempting to access the admin area via a directory that is not configured. errors.
Blank or Partially-Rendered PagesTroubleshoot and resolve blank or partially-rendered pages after an update.
Character Display in ReportsTroubleshoot and resolve incorrect display of accented (Unicode) characters.
cURL Couldn't Connect to Host ErrorsTroubleshoot and resolve Curl Error - Couldn't connect to host (7) errors.
cURL Couldn't Resolve Host ErrorsTroubleshoot and resolve Curl Error - Couldn't resolve host (6) errors.
Dataset Must Be Array ErrorsTroubleshoot and resolve InvalidArgumentException: Query string must not include a URI fragment errors.
Duplicate System Theme OptionsTroubleshoot and resolve duplicate system themes appearing in the System Theme menu.
Failed Opening ErrorsTroubleshoot and resolve main(): Failed opening required '/path/to/whmcs/..filename.php' errors.
ionCube Fatal Decoding ErrorsTroubleshoot and resolve Fatal error: The file was encoded by... errors.
ionCube Loader Site ErrorsTroubleshoot and resolve Site error: the ionCube PHP Loader needs to be installed. errors.