from what I know thats somewhat normalish, its this that keeps it from starting
java.lang.UnsupportedClassVersionError: mrtjp/projectred/compatibility/CompatibilityCorePlugin : Unsupported major.minor version 51.0
From what I have read off of the forums here project red (old RP2) has removed support to older java's yet for me at least the newest.
To my understanding its going to be fixed but I have no idea how long it will be.