Troubleshoot and resolve issues with email importing retrieving the same email replies multiple times. Troubleshoot and resolve issues with DUPLICATE_INVOICE_ID errors. Troubleshoot and resolve issues with duplicated invoices for different dates. Troubleshoot and resolve issues with the system generating duplicated invoices for the same date. Troubleshoot and resolve issues with DirectAdmin sending piped email replies twice. Troubleshoot and resolve duplicate system themes appearing in the System Theme menu. Troubleshoot and resolve 1062 Duplicate entry for key tblconfiguration.PRIMARY errors. Troubleshoot and resolve 1062 Duplicate entry for key tblinvoices.PRIMARY errors. Troubleshoot and resolve issues with multiple duplicate transactions occurring for the same service or invoice. Troubleshoot and resolve issues with valid email being flagged as spam. Troubleshoot and resolve The system blocked a potential email loop. (WHMCS 8.4 and later) or Blocked Potential Email Loop (WHMCS 8.3 and earlier) errors. Troubleshoot and resolve TypeError: array_search(): Argument #2 ($haystack) must be of type array errors. Troubleshoot and resolve Customer with email '[email protected] ' is not found in panel errors. Troubleshoot and resolve email template syntax errors. Troubleshoot and resolve empty pages while using WHMCS. For many types of issue, the first step in troubleshooting is enabling WHMCS's error reporting system. Troubleshoot and resolve cURL errors while using Enom for domain registration. Troubleshoot and resolve Domain name not found errors while using Enom for domain transfers. Troubleshoot and resolve Cannot parse empty response from server/Empty data response from server - Please try again later errors while using Enom for domain registration. Troubleshoot and resolve Invalid data response from server - Please try again later errors while using Enom for domain registration.