Hi,
I can help you fix the issue.
Problem is, you have to install ioncube loader in your hosting.
Things to do,
Kindly ask whether your hosting provider provides ioncube loader.
One more thing, ioncube will be encoded for your domain or ip. Hope you have same domain or IP
Once file is encoded, you wont able to view the files.
For a temporary fix, you need to remove the "wordpress vtiger form" plugin directory. Kindly take a backup of that folder. After removed the plugin, your website will start working.
I will be available from 8P.M to 1 P.M Indian time. Ping me for more assitance
Thanks,
Raj