TrevsGaming24

First I downloaded the launcher. I went in the launcher, selected attack of the b team, put it on version 1.0.12a, and pressed save. Then I clicked play and it started loading. When it finished loading, it went out of the launcher for about 5 seconds, then brought me back to the launcher. A video I watched showed that it is supposed to go to Minecraft, but mine keeps bringing me back to the launcher. I have tried other versions (older and newer),i have tried resetting it, but nothing is working. CAN SOMEONE PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!