Hello,
Please note the error you get:
PHP Fatal error: require_once(): Failed opening required '/home/bsmnfkww/public_html/export/examples/Contents/addText/../../../classes/CreatePptx.php'
is a PHP error, not a phppptx error. That PHP error appears when the PHP file you are including (witn include/include_once or require/require_once functions) can't be read/opened. We recommend you check you have copied the classes folder to the correct path (and all files) and all PHP files have the correct rwx permissions.
Regards.