I installed a WordPress theme and on the page where it should display, half of it loads with this error?
That looks like a Revolution theme. The function is a custom function that is included with the theme when you buy it. It is not a standard WordPress function. You should find this in your download in either the functions.php file or it may have been provided as a plugin.
If you do not have this custom function you will need to contact the developer. It might be possible to remove the function and replace it with the excerpt but this is a commercial theme and I haven't seen the code for it so I can only guess that this would work. (I make my own themes and don't buy them ;))
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