If you receive this error after trying to convert to suPHP on a DirectAdmin server, suPHP didn't build properly. The full error shown is as follows:
[Sun Sep 15 17:45:23.133872 2019] [:error] [pid 24275:tid 139740033627904] (2)No such file or directory: [client IP.IP.IP.IP:53478] couldn't create child process: /usr/local/suphp/sbin/suphp for/home/admin/public_html/index.php
You will need to run the following to rebuild suPHP and correct this:
cd /usr/local/directadmin/custombuild ./build suphp d ./build rewrite_confs
The full set of commands to run when converting from any PHP handler to suPHP after editing the CustomBuild options,conf file properly is as follows:
cd /usr/local/directadmin/custombuild ./build update ./build php d ./build httpd d ./build suphp d ./build rewrite_confs
The error should be resolved once you've built suPHP.
If you have any trouble, feel free to open a ticket with KnownHost support! :)