If you see an error on your website like the one below, it means that you need to install Zend Encoder to load the file.
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If you are running cPanel/WHM on your server you can easily install Zend Encoder from the "Easy Apache" menu. Below are some screenshots detailing the process in WHM, simply use your existing Apache/PHP settings and then check the Zend Encoder checkbox on the options list near the end of the process.

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