I can launch the launcher as usually,
I click on "Solo"
I create a new world, or I play in an already existing world on creative or survival (it does the same)
There is written "preparing spawn area",
It load to 95%, and then it takes me back to the launcher with an error message
Here is the crash report :
We are unable to diagnose your issue due to the lack of proper debug information. Please review the guidelines before reporting issues.
In case of a game crash, please also attach the crash log from
[minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/guides/finding-minecraft-data-folder/].-- I am a bot. This action was performed automagically!