When i try to play 1.6.2 version on the 1.3.8 launch it loads then disappears then the play button is grayed out and when i go to the development console, it says "does not exist"

I normally just change the version and it plays
Then this started happening

Then it did not exist
The play button is gray and it "does not exist"

Steps to Reproduce:
1. Open up launcher
2. Edit profile
3. Select 1.6.2 version
4. Save Profile
5. Click "Play"
6. Wait for the green bar
7. Once it disappears and the play button grays out, click development console and you see the errors