Minecraft Forge will not launch, how do I fix this problem?

So, I download forge, and I try to play it on the launcher. It opens Game Output, and immediately closes the launcher and does nothing. I tried uninstalling Java 8, then installing Java 7. Still does not work. It still tries to jre-x64\1.8.0_25.
Added (1). (1.7.2-Forge10.12.2.1147)

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