Try the latest 1.6.4 version. Minecraft changed the location of their resources and libraries, so Forge is looking in the wrong places now. The last 1.6.4 uses the old install system, but if you want to you can try the new build system called ForgeGradle by using the 2nd to last 1.6.4 version. This would be a good idea as this is the only way for 1.7+.
Good luck!
(P.S. if you want to stick with 1.6.2, you can probably snatch the new locations from the 1.6.4 scripts)