1) Follow directions. It sounds like you're missing ModLoaderMP
http://wiki.industrial-craft.net/index.php?title=Download
i have try to reinstall the modloaderMP , but i still don't have the mods folder , is there any other method that can make it work?
or if you can just your minecraft server folder (without your map) and upload to mediafire and post the link here for me to download?
thanks for your help 
here are some question that i encounter during the installation of IC2:
1.when i try to following the instrustion on : http://www.minecraftforum.net/…dustrialcraft%c2%b2-v115/ to install IC2 on my server,i followed all the instruction and successfully install on client side , but according to the instruction about the server side , i should have got a mods folder , which i don't have. i tried to create one by myself , but still fail.can anyone send me somekind of more detailed instruction on this?
2.can normal map(maps that i played before i install mod) to be keep using after i install mods ? if not , is there any tools that i can make it work? i tried the one posted in the Q&A thread
, i opened it and only a CMD screen pop out and blink for one time , it seems that inside the screen have show a few words , but it blink so fast that i couldn't read it.
please help me to solve the above problems , thanks
