You will get the same errors if you have Flash on the page.
I remoned the Flash from the page and all worked well. When I was done using Theme-it
I added the flash back to the page. But you could set your flash to export and image of the flash file when it is published ( you can set that in the flash properties panel) then use the flash image as a place holder for the flash (so you can use the colors with Theme-it)
then just replace the image of the flash file with the Flash animation.
It's a work around that worked well for me.
Hope it helps