Wordpress Invalid Argument Error

Hi, I am getting an error in certain areas, and the items are not displaying. One error occurs with my sliders. There not visible anymore. When I go to anyone of them, I get the following message:

Warning: Invalid argument supplied for foreach() in /home/content/76/10036276/html/beta/wp-content/themes/Beta/framework/meta/meta_class.php on line 218

Coincidentally, my timeline is no longer appearing either, and has a very similar error:

Warning: Invalid argument supplied for foreach() in /home/content/76/10036276/html/beta/wp-content/themes/Beta/framework/meta/meta_class.php on line 218

What can I do to fix these?