The call is ambiguous between single method i.e extension method

Question

I have an extension method like

public static class Extension
{
    public static string GetTLD(this string str)
    {
        var host = new System.Uri(str).Hos         


        

Answer 1

I have found this solution in the comments above. And it helped me.

I have the reference to project A in the project A. By mistake.

Removeing helps =)