Craft of minecraft when launch it
What I expected to happen was...:
Just start the game
What actually happened was...:
Crash of minecraft when i start it, on all of my sologame (i don't play multi)
Steps to Reproduce:
1. Just launch a game
2. Wait 2-3seconds and crash of minecraft
The report file in attachment
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Please attach one of the affected worlds to this report.

Sorry i can't compress more
This is the part one of on of affected worlds

part 2 of 4

Does your crash or world involve pistons?

World involve pistons