StructureMap Exception Code: 202 No Default Instance defined for PluginFamily

Question

I am new to StructureMap. I have downloaded and am using version 2.6.1.0. I keep getting the below error:

StructureMap Exception Code: 202 No Def

Answer 1

Mine was because I had accidentally referenced the concrete type in the constructor of another class rather than the interface

eg in structuremap i had

x.For().Use();
x.For().Use();

and constructor for Foo looked like this

public class Foo : IFoo {
    public Foo(Bar bar) {...}
}

when it should have looked like this as SM couldn't just create an instance of Bar, it only knows how to make an IBar:

public class Foo : IFoo {
    public Foo(IBar bar) {...}
}

It also meant that my exception referenced the concrete type instead of the interface but I missed that initially