How to troubleshoot TCPDF image size errors while downloading invoices.
How to troubleshoot TCPDF timeouts during invoice generation.
Troubleshoot and resolve 1013 - Template does not exist errors.
Troubleshoot and resolve The system could not find the ticket ID. (WHMCS 8.4 and later) or Ticket ID Not Found (WHMCS 8.3 and earlier) errors.
Troubleshoot and resolve TypeError: Argument 3 passed to errors.
Troubleshoot and resolve TypeError: Return value of convertIniSize() must be of the type int errors.
Troubleshoot and resolve TypeError guessFileExtension() errors.