Using structure map with MSTest

I have created myself a test project with a single test in it. Within the "TestInitialize" method I'm trying to call my StructureMap setup method where I set which concrete instances should be used for which interfaces.

However as soon as the test tries to run I get a {"Operation could destabilize the runtime."} exception. Without using structuremap it works fine (but obiviously I need it in there).

Can anyone point me in the right direction as to what might be caus开发者_StackOverflow中文版ing this exception?

After a lot of messing around, I discovered that all I needed to do was to right-click on the StructureMap dll and click "Unblock" and the permissions were sorted.