I was able to fix this by contacting my host, who advised me as follows:
Upon further checking, the current version of PHP running in your server is 4.4.9. If you wanted to upgrade the version of the PHP, you can configure that by uploading the .htaccess file to the directory where your domain name is pointing to. To create the .htaccess file, you can use a text editor software, like Notepad, and you should insert the code provided below into it.
AddType x-mapp-php5 .php
