C# NAPI missing methods?

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Hello

im facing missing methods on the C# server side NAPI for example Create3DColShape and CreatePed throws a method not found error

 

what's interesting is that these functions will auto-complete when you type them in but you get this error when running the server

 

note : im using net core 3.1 but when i first began working on my project i went to the nuget package browser and searched for gtanetwork api but it only came up with version 0.3.7 i coul'dnt find the 1.1 DLL so i had to get it from the internet and manually add it to the project

 

any idea on why's this happening??

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found the solution here