WHMCS Tags troubleshooting-article Troubleshoot and resolve Things don't appear to be working at the moment errors while using a PayPal payment gateway module. Troubleshoot and resolve Unrecognized Currency errors while using a PayPal payment gateway module. Troubleshoot and resolve Error Code PE101, Account is not approved to sell., or Account has been closed. errors while using the 2CheckOut payment gateway module. Troubleshoot and resolve Plesk permission denied errors. Troubleshoot and resolve PHP Fatal error: Maximum execution time of 300 seconds exceeded in /path/to/file.php errors in WHMCS. Troubleshoot and resolve 503 Service Temporarily Unavailable, Page not Found, Timeout, or 502 Bad Gateway errors. Troubleshoot and resolve Plesk permission denied errors. Troubleshoot and resolve a POP3 cron not running emails and WHMCS Pop Cron Did Not Run errors. Troubleshoot and resolve General error: 3988 Conversion from collation utf8mb3_unicode_ci into latin1_swedish_ci impossible for parameter errors. Troubleshoot and resolve Error: read failed - connection closed? errors. Troubleshoot and resolve issues with pricing displaying incorrectly in the shopping cart. Troubleshoot and resolve Product attribute Package Name XXX Not Found on Server errors. Troubleshoot and resolve Required Product Module Missing errors. Troubleshooting and resolving MarketConnect promotion display issues. Troubleshoot and resolve Missing the following: Ending /QGWRequest, Ending /Authentication, Ending /GatewayKey errors while using the Quantum Vault payment gateway module. Troubleshoot and resolve InvalidArgumentException: Query string must not include a URI fragment errors. How to troubleshoot question marks replacing text in PDF invoices and quotes. Troubleshoot and resolve cross-selling recommendations that are not displaying properly. Troubleshoot and resolve redirect loops. Troubleshoot and resolve issues with Automatic Domain Registration on Payment Suppressed errors.