Due to the fact that MochaHost cannot offer support for third party application specific issues/errors, we highly recommend that you visit the application's vendor support page. These often will contain the exact fix that you need or a guide on how to resolve your specific issue.
Here are some of the more popular application support pages:
Zen Cart: https://www.zen-cart.com/forum.php
If your application is not listed above you can look online for the support page in your specific case.