Troubleshoot and resolve PHP Fatal error: Maximum execution time of 300 seconds exceeded in /path/to/file.php errors in WHMCS.
Troubleshoot and resolve Required function is not available errors.
Troubleshoot and resolve Segmentation fault errors.
Troubleshoot and resolve TypeError: Return value of convertIniSize() must be of the type int errors.
Troubleshoot and resolve TypeError guessFileExtension() errors.