Cache Error

Hello-
I was working on updating content on my website and all of the sudden I notice a cache error at the footer of each page (only I can see it, as the WordPress admin). I do not have any cache plug-ins. I haven’t touched any plug-in’s other than updating my theme and 2 mandatory plug-in’s earlier this morning (like I do every few weeks). SO I dont think that would be related. I called my hosting company, and they said they can’t help because it seems to be only a WordPress issue. My website looks normal to the public, but internally this error won’t go away. I can’t find anything on google or these forums. Does anyone know what the problem could be? Please help!!

This is what the error says:

Cache Error: Looking for cache that doesn’t exist. Now using a backup feed.
This error is only visible to WordPress admins.
If you are using a caching plugin, try enabling the option on the Customize tab ‘Cache error API recheck’ or ‘Force cache to clear on interval’