Jemsin

I had this problem until I opened the launch.bat file and before the command that's already written there, I navigated to where my Tekkit.jar file was stored Originally the file (launch.bat) looked like: java -Xmx3G -Xms2G -jar Tekkit.jar nogui pause which I modified to: cd C:\Users\Ben\Desktop\Minecraft\server java -Xmx3G -Xms2G -jar Tekkit.jar nogui pause cd is the change directory command in Windows command line, obviously that directory is going to be different for any one else, so you just need to change that line to where your Tekkit.jar file is Hope that helps others