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Invalid Session error when attempting to join localhost server


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Hi, I am new to modding and this forum, please tell me if there is another post here that addresses my problem, I might have missed it.


I am following the modding guide here, and I am at the bottom step (of the linked page) that is addressing starting and joining a localhost server.

I run 

gradlew runServer

and then separately

gradlew runClient

When I attempt to join the server by making a direct connection to localhost, minecraft gives me an invalid session error. What am I doing wrong here?

Let me know if there is additional information I can provide to help. I have experience with Java, just not Minecraft Modding.

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