WHMCS Troubleshooting Troubleshoot Updates Make sure to check for any problems both during and immediately after the upgrade process. Troubleshoot and resolve Application configuration file is not writable errors. Troubleshoot and resolve The system failed to fetch the packages.json file: the response was empty. Check your CDN connectivity. errors during unattended automatic updates. Troubleshoot and resolve an unattended automatic update that fails because the user under which WHMCS runs cannot write to or read a necessary file. Troubleshoot and resolve The version field is missing for <version> in the packages.json patches section errors during unattended automatic updates. Troubleshoot and resolve Version not found in packages.json patches section errors during unattended automatic updates. Troubleshoot and resolve issues that cause the system to disable automatic updates. Troubleshoot and resolve Check for Updates Failed errors. Troubleshoot and resolve the messages that appear when the installer cannot verify or save your credit card encryption hash while you update WHMCS in the browser. Troubleshoot and resolve A fatal error occurred while fetching the update errors. Troubleshoot and resolve issues that affect multiple features immediately after an update. Troubleshoot and resolve File could not be downloaded errors. Troubleshoot and resolve GuardedForUpdate errors. Troubleshoot and resolve Failed to remove legacy modules errors. Troubleshoot and resolve the ionCube Encoder® error that makes the Admin Area return HTTP 500 after you update WHMCS. Troubleshoot and resolve Check for Updates Failed errors. Troubleshoot and resolve new versions not appearing after checking for updates. Troubleshoot and resolve No Existing Installation Was Detected errors. Recover from an unattended automatic update that permanently fails after the system exhausts its retry attempts. Troubleshoot and resolve Make certain that you have selected a valid Update Channel and then try again errors.