You seem to have fallen for the "Nibiru hoax". Eris is a dwarf planet in the
outer solar system, a bit larger than Pluto, discovered in 2003 (see
Wikipedia article at http://en.wikipedia.org/wiki/Eris_%28dwa... ). Nibiru
does not exist; it is a hoax, and certainly it has nothing to do with Eris.
Wikipedia summarizes nicely: "There are a number of planets or planetary
bodies whose existence is not supported by scientific evidence, but which
are occasionally believed to exist by pseudoscientists, conspiracy theorists
or certain religious groups". Neither Eris nor Nibiru will flyby Earth in
2012 or any other time.