PHP Plugin not loading page...

Need help from anyone who can help... I'm building a plugin which will help our company and the general public to install a custom wordpress installation. At the company, there are a limited number of themes that we use. And a few combination of plugins depending on the type of website. Using the built-in Site Builder plugin from WHM is good. But then it takes us a fair bit of time to add all the plugins and themes and activating them. Then delete the sample posts and unwanted plugins. I've built the script to create the database and install themes and plugins. It all works in local development (MAMP) but the same script uploaded to cpanel doesn't work. I've tested that the plugin has been successfully installed. I replaced the PHP script with simple html and it worked. The plugin can be download from here: