The type `System.ValueType' is defined in an assembly that is not referenced

Unity Engine
1

Ok i’m new to unity but after following several tutorials i wanted to try to see if i get this working and i can not.
I imported all the assets from GW2NET and when i edit the code in visual studio i finds all references without a problem.

but when going to unity after i save the files i get this error

The type `System.ValueType’ is defined in an assembly that is not referenced. Consider adding a reference to assembly.

its referring to this line

Debug.Log((float)myavatar.AvatarPosition.X);

can anybody explain to me what i’m doing wrong? again all the needed files are imported in Unity.

here is the sample code that I tried to see if i could read the data needed.

using GW2NET.MumbleLink;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class MainCamera : MonoBehaviour
{
    // Use this for initialization
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {
        var mumbler = MumbleLinkFile.CreateOrOpen();
        var myavatar = mumbler.Read();


        if (target != null)
        {
           Debug.Log(transform.position.x);
            [code=CSharp]Debug.Log((float)myavatar.AvatarPosition.X);

}
}
}[/code]

2

ok i found something i should add system.runtime.dll to the reference. but now i get

tried every version there was in the refference assemblies .net frameworks folder.