I got the error when I was messing around with animations, video on both horizontal and vertical in the same layout file.
It did allow me to save my progress even after getting the error.
It's been a while since I messed with the offending layout, but I just tried it again and aren't getting any errors.
I had apparently deleted the animations, but still had video and video 2.
Try getting rid of some of the less main-stream elements and see if the problem goes away.
I'm thinking that I had odd sized images for the animations or something....or was using the horizontal ones on the vertical version or something....
or maybe just a memory thing that has gone away because the memory has been filled up with other things.
I just a dumb end-user