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Error while trying to join a friends world, Also cannot get this friend to join my world.

Salad_Lad_4_Hire
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Salad_Lad_4_Hire Tree Puncher

Salad_Lad_4_Hire

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I have been receiving an error while trying to join a friends world while using the "Project Architect 2" modpack with the "essential mod" added on.

All mods are updated and all modloaders are up to date.

 

The error specifically says

 

" The game crashed whilst ticking screen Error: java.lang.NullPointerException: Cannot invoke "org.apache.commons.lang3.tuple.Pair.getLeft()" because the return value of "java.util.Map.get(Object)" is null "

 

Exit code: -1 

 

Any advice? I also cannot get this friend to join my world, I can get other friends to join no issue though. No error codes from them cause they are a little "Tech Slow"

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