ionCube not recognized by wordpress.

Hello,

I have several wordpress sites that run on a vps. When I try to install one plugin in particular on one of my wordpress sites, I get the following error message:

The Author hReview plugin requires the ionCube PHP Loader to be installed on your web hosting, in most cases you will have it already installed but (not activated), just follow these steps:

1- Login to your cPanel.
2- Under the Software/Services category, click on the PHP Config icon.
3- Inside of this, you will find the option to select Ion Cube
4- Select this and hit Save Changes

The other way to go is to contact your web hosting and ask for their assistance, or if you are the website operator please use the ionCube Loader Wizard to assist with installation.

All the other sites have no problem installing this plugin and ionCube is installed on the server.

I have no idea how to start troubleshooting this. Any help appreciated.