Beta 26 Upgrade issue."serious error"
 

Upgraded from 25 to 26

As a result the site loads up an error.
There is a serious error and the page cannot be rendered

If I log in (into the control panel then go to the site) most everything works, except for images(thumbs work thou). It seems its affecting public viewed items?

Any idea how to fix this?

Ive uploaded all new files rewriting the old ones, tried re-upgrading, made sure configs were fine.