M4d3L

Hi. I already have a world using bukkit 1.1 R4 with BC, IC2, RP, Railcraft. and I want to move to tekkit. is it possible? I have try to start a tekkit server to test my world but when I login I got : then the server crash. maybe its a block ID problem but is it fixable? or is there a way to remove all block I want to automatically clean IC2/BC/RP block from the world before I transfert it on Tekkit? This way can save some part of building player done.