Hello JustinBannister,
The type of error you're reporting is usually caused by updating the layout of a page in order to include an element that doesn't exist anymore, such as a custom component. There's no way to tell for sure based on the information posted here, but we'll be happy to assist you in locating the issue if you raise a Support case for further analysis.
edit: It'd probably help if I provided a link on how to get Support from us! Sorry about that. http://lithosphere.lithium.com/t5/support-knowledge-base/Getting-Support-From-Lithium/ta-p/96668
Regards,
Ted C
Customer Support
