Create an instance based on a stringvalue

I wish to create an instance of a class, using a string value. According to what I read here: Activator.CreateInstance Method (String, String) it should work!

public class Foo
{
    public string prop01 { get; set; }
    public int prop02 { get; set; }
}   

//var assName = System.Reflection.Assembly.GetExecutingAssembly().GetName().Name;
var assName = System.Reflection.Assembly.GetExecutingAssembly().GetName().FullName; 
var foo = Activator.CreateInstance(assName, "Foo");

Why won't this work? I get the following error:

{"Could not load type 'Foo' from assembly 'theassemblyname, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.":"Foo"}