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Custom modpack crashing upon game launch


SolidMercury

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i'm putting together a modpack for me and some friends, i add a few mods then check if there any problems, well there are and i cant seem to fix it... this is the crash message 

The game crashed whilst initializing game Error: java.lang.IllegalAccessError: class com.laidbacksloth.brightnessslider.BetterSlider cannot access its superinterface net.minecraft.client.OptionInstance$SliderableValueSet (com.laidbacksloth.brightnessslider.BetterSlider is in module [email protected] of loader 'TRANSFORMER' @713a35c5; net.minecraft.client.OptionInstance$SliderableValueSet is in module [email protected] of loader 'TRANSFORMER' @713a35c5)

 

there is also a much longer message in the full crash report

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com.laidbacksloth.brightnessslider.BetterSlider

Issue with whatever mod provides that class.

If you didn't truncate error messages, we could probably tell you the jar name of the mod that is causing the problem.

Boilerplate:

If you don't post your logs/debug.log we can't help you. For curseforge you need to enable the forge debug.log in its minecraft settings. You should also post your crash report if you have one.

If there is no error in the log file and you don't have a crash report then post the launcher_log.txt from the minecraft folder. Again for curseforge this will be in your curseforge/minecraft/Install

Large files should be posted to a file sharing site like https://gist.github.com  You should also read the support forum sticky post.

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