420 clutch/transmission problems!!!

Hey guys,
so i was riding my 2008 420es today when all of a sudden my clutches started slipping to the point were the bike wouldnt move, we tried to adjust them my backing the nut off but and twisting the adjustment screw, but it wouldnt move. the es wouldnt let it shift into neutral and the manual shifter wouldnt turn the shaft you put it on, so we towed the bike stuck in 1st with the clutches open, halfway down the highway it locked the back end up and they would engage but slip! so i drove it home in 1st, got it in neutral and now it wont go into any gear with the es or back up shifter! thinking the shifting fork coiuld have something to do with this but im not sure!
Any help is much appreciated!!
Thanks in advance!