Launcher Bug / Do not answer

Put the summary of the bug you're having here

The MineCraft Launcher does not want to lace up.
It hangs just after it has appeared.

Translation from French to English.

What I expected to happen was That it launches
Describe what you thought should happen here

What actually happened was That it is blocked:
Describe what happened here

Steps to Reproduce:
1. When I got the new MineCraft Launcher interface.
2. When I try to launch MineCraft, it crashes and stays like that.