Troubleshoot and resolve Entity reference not found errors while transferring a domain using CentralNic Reseller. WHMCS makes troubleshooting easier with built-in error handling. Troubleshoot and resolve ExceptionLoggingTrait Class Not Found errors. Troubleshoot and resolve Exchange Rates Update Results errors. Troubleshoot and resolve issues when attempting to use an admin invitation link. Troubleshoot and resolve App Note Setup: This app is still in development mode, and you don't have access to it. Switch to a registered test user or ask an app admin for permissions errors while authenticating using Facebook® Sign-In Integrations. Troubleshoot and resolve Can't Load URL: The domain of this URL isn't included in the app's domains errors while authenticating using Facebook® Sign-In Integrations. Troubleshoot and resolve main(): Failed opening required '/path/to/whmcs/..filename.php' errors. Troubleshoot and resolve The following recipients failed errors. Troubleshoot and resolve A fatal error occurred while fetching the update errors. Troubleshoot and resolve Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 20480 bytes) errors. Troubleshoot and resolve issues that affect multiple features immediately after an update. Troubleshoot and resolve Field xxx doesn't have a default value errors. Troubleshoot and resolve issues with `<field> is required` errors in Authorize.net. Troubleshoot and resolve The file cannot be decoded errors. Troubleshoot and resolve File could not be downloaded errors. Troubleshoot and resolve File Not Found errors. Troubleshoot and resolve issues with free domains appearing at full price. Troubleshoot and resolve issues with frequent logouts. Troubleshoot and resolve Access token not active errors while using the GoCardless payment gateway module.