Latest Launcher version 2.1.5322 appears to have broken AMIDST. Please see https://github.com/toolbox4minecraft/amidst/issues/502

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/finding-minecraft-data-folder].

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It's up to the developer of AMDIST to fix this.