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@AetherPirate what you said worked but now I have another problem, I added some mods and now when I start it, it loads in the Technic Launcher, but when it is finished with loading the Technic Launcher closes and reopens again, I don't know what to do.

Ehmm... Hello I really need some help with my Modpack, when I start it, it only shows up Vanilla Minecraft and I had tried to fix this, but after a week I don't see a solution. Here is the Link to my Modpack: http://www.technicpack.net/modpack/the-only-nach-nations.962140