C#: Call non-generic method from generic method

class CustomClass<T> where T: bool
{
    public CustomClass(T defaultValue)
    {
        init(defaultValue); // why can't the compiler just use void init(bool) here?
    }
    public void init(bool defaultValue)
    {

    }
    // public void init(int defaultValue) will be implemented later
}

Hello. This seems to be a simple question, but I couldn't find an answer on the Internet: Why won't the compiler use the init method? I simply want to provide different methods for different types.

Instead it prints the following error message: "The best overloaded method match for 'CustomClass.init(bool)' has some invalid arguments"

I would be glad about a hint.

Best regards, Chris