Solved Can't reference "RustPlugin" Or [Info()] (missing .NET Framework)

My Problem:
When i try to inherit the class "RustPlugin" and add the Attribute [Info()] i get a error 3 errors all saying the same thing.

//Code
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//Errors
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//Assemblies
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I saw a similar thread with the same issue i'm having but he didn't post the errors being thrown so i don't know if our situations are identical.

//Similar Thread
Solved - C#: What to put for using? | Oxide

After posting this i saw yet another similar thread with almost the exact same problem i'm having. But i never saw a actual fix to the problem.
Also yes i have referenced "Oxide.Core.CSharp;"

//Similar Thread
Solved - The type 'Attribute' is defined in an assembly that is not referenced | Oxide

I feel like im making a simple mistake but i cant figure it out for the life of me.

Things ive tried:

• Restarting visual studio.
• Changing to .NetCore
• Getting the nugget package "package.mscorlib"
• but every time i tried to get it it fails. This happens with other nugget packages too.

Extra Info:

• The project is a .net Standard Class library
• I got the assemblies from the "Manged" file in Oxide for Rust | Oxide
• and i got the UnityEngine.dll from my unity files on my pc.

I appreciate all helpful feedback.

 

Yea i referenced all of them. Where could i get DLLs not corrupt if that's the case?

 

No its not in 3.5 but i don't seem to have .NETStandard 3.5 and i cant seem to download it.

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This is what you are talking about right?

 

I figured out the problem. My project was .NETStandard and not .NETFramework, that's why i couldn't target .net Framework in .NETStandard.
I knew it was stupid mistake.

Thanks for all the help and quick responses. Sorry for being stupid lol.