well did you install it correctly since all you need to really install is modloader mp and put the folder from sdk's guns in the mods folder
oh and wrong section
what you do is you install the NEWEST forge, v4 i think, then the newest modloaderMP and the Newest SDK gun mod. It helps if you install the SDK gun mod last and you run it after forge and modloaderMP. Also you DO NOT delete the META-INF... IN THE SERVER... thats probably why...
Invalid or corrupt jarfile minecraft_server.jar
logout
[Process completed]
Someone please help!
oh and wrong section