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Minecraft forge crashing


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Hey everyone. 

forge keeps crashing in eclipse. Though this isn't crashing in IntelliJ can anyone help me with this? It might be something small.

I get thrown this exception 

Error: Unable to initialize main class net.minecraftforge.userdev.LaunchTesting

Caused by: java.lang.NoClassDefFoundError: com/mojang/authlib/exceptions/AuthenticationException

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