assembly does not allow partially trusted callers

Question

I am building a site using fluent NHibernate, which works just fine on the dev box. However, after I uploaded it to my host I get the following when trying to run it.

"System.TypeInitializationException: The type initializer for 'NHibernate.ByteCode.Castle.ProxyFactory' threw an exception. ---> System.Security.SecurityException: That assembly does not allow partially trusted callers.

Is this something I will need to resolve with the hosting company (CrystalTech)? Any help much appreciated.

The rest of the inner exception:

at Castle.DynamicProxy.ModuleScope..ctor(Boolean savePhysicalAssembly, String strongAssemblyName, String strongModulePath, String weakAssemblyName, String weakModulePath) at Castle.DynamicProxy.ModuleScope..ctor(Boolean savePhysicalAssembly) at Castle.DynamicProxy.ProxyGenerator..ctor() at NHibernate.ByteCode.Castle.ProxyFactory..cctor() The action that failed was: LinkDemand The Zone of the assembly that failed was: MyComputer

--- End of inner exception stack trace ---

Answer 1

nHibernate does not work out of the box on a medium-trust environment (which most shared hosts run your application under). Lazy Loading with nHibernate Under Medium Trust describes some of the steps taken to try to get it working.