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.
Troubleshoot and resolve Unable to communicate with the WHMCS installation errors.
Troubleshoot and resolve Unable to connect to the database errors.