when I run my launcher pre-release 1.8 my game crash

Put the summary of the bug you're having here
when I run my launcher pre-release 1.8 my game crash
What I expected to happen was...:
Describe what you thought should happen here

What actually happened was...:
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Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...i've launch my game in pre-release 1.8 and my game have crashing
3. ...