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whenever i try to play FTB StoneBlock 2 on the launcher it gives me and error and then resets

RiverRoulette
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RiverRoulette Newbie

RiverRoulette

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OpenJDK 64-Bit Server VM warning: Ignoring option MaxPermSize; support was removed in 8.0
Exception in thread "main" java.lang.ClassCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.URLClassLoader (jdk.internal.loader.ClassLoaders$AppClassLoader and java.net.URLClassLoader are in module java.base of loader 'bootstrap')
    at net.minecraft.launchwrapper.Launch.<init>(Launch.java:34)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
this is the error and i have no idea what it means, please help

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brunyman Beyond the Horizon

brunyman

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Hi, what operating system do you run? Windows, MAC, Linux?

What launcher executable do you use?

Try to delete your launcher installation and download the latest version here:

Do a fresh install

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