Tech Support section is for getting help with FTB related problems.
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So, I downloaded the legacy ftb, used the ftbinstall .bat file, made it so no taint biomes spawn, and then, started up the server. First error I get is here. http://pastebin.com/LfMZZRXe
Thank You.
That looks pretty obvious. Java needs to be re-installed. Also, you need to use the 64 bit version of java. Don't use the x86/32bit version. You will not have enough ram for the game otherwise.