Hello i dont know where to begin. All of a sudden MY WEBSITE is displaying this error when i view a node-

Warning: array_flip() [function.array-flip]: Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->load() (line 178 of /home/onlineba/public_html/onlineplac.es/includes/entity.inc). Warning: array_flip() [function.array-flip]: Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->cacheGet() (line 355 of /home/onlineba/public_html/onlineplac.es/includes/entity.inc).

I havent added anything or changed anything. I was hoping it was because OG groups upgraded to 7.2 but i seem to get it when viewing a node that is not in a group. Let me see my page content type as thats got no OG fields attached or postable in groups.... yes exactly the same thing. its only got a title, body and image field attached to it. Oh and a term referance. Lets remove that...yes still the same.

Panels node page is disabled. Im sorry i cant tell you anymore about my problem but if anyone could be a lifesaver and offer any advice it would be gratefully reveived. I get really depressed when things like this happen. :(

thanks