Hello Wendelika,
Thank you for your question. This type of error is commonly caused by a bad Wordpress Plugin. Since the plugins are coded by separate 3rd party developers, this type of incompatibility can occur. You can troubleshoot the issue by disabling the plugins. Rename your Wordpress plugin folder, in the root of your wordpress site look for:
/wp-content/plugins
Rename the plugins folder something like:
plugins.old
Now create a new folder called plugins, and move them one at a time from: plugins.old
To: plugins
Test your site after you move each plugin, and when you get the fatal error, then you know it was the last plugin you moved.
Just delete or replace the plugin to stop the error.
If you have any further questions, feel free to post them below, or contact live Tech Support.
They are available 24/7 via:
Email: [email protected]
Phone: 888-321-HOST (4678)
757-416-6575 (Intl.)
&
Chat (there is a link on the top right).
Thank you,
-John-Paul