Herobane

Ok, I'm very new to Tekkit but I've been playing Vanilla Minecraft for a year now and already have a Vanilla Server. I would, however like to have a server on my PC for Volts so my friends and I can play. I downloaded the Voltz Server thing (on the Voltz page) and ran it. I've ported to 25566 as 25565 was already in use. When I try to join, I'm met with the following message: Forge Mod Loader has found a world ID mismatches ***ched. World: (ModID: Minecraft, type uv, ordinal 2) Game (ModID: Railcraft, type rc.item.cart.furn*** ***tched. World: (ModID: Minecraft, type uv, ordinal 1) Game (ModID: Railcraft, type rc.item.cart.ch*** ***tched. World: (ModID: Minecraft, type uv, ordinal 0) Game (ModID: Railcraft, type rc.item.cart.ba*** You cannot connect to this server *** is where the text goes off the screen I've got the 1.4.7 version of Minecraft Server and 1.4.7 Voltz but the two don't seem to want to link together and I can't fix it because I'm not that computer savvy. Is there another, more up-to-date Server program or even a Bukkit version for Voltz? Any tips on solving this would be great and I'm sorry if I posted this in the wrong place on the forum but I didn't know where else to go!