UBB.threads PHP Forum Software Community Forums UBB.threads 7 Version 7 Support Uncaught Error in class.phpmailer.php

Is your forum running on FreeBSD?
On FreeBSD, this library is NOT included automatically. It must be manually installed. This can be done with the following command:

source:
https://www.php.net/manual/en/ctype.installation.php

further reading here:
https://www.php.net/manual/en/intro.ctype.php
and here:
https://www.php.net/manual/en/book.ctype.php

in your forum's PHP Info page, you should see under ther ctype section,