Code access security for SSRS 2012 extension?

I have a SSRS 2012 IAuthenticaitonExtension that I am trying to get up and running.

Currently, it blows up trying to load one of 3rd party required assemblies.  How do I configure SSRS to allow .NET to load my DLL's?

Failed to initialize the AppDomain:ReportManager_MSSQLSERVER_0

Exception: System.Web.HttpException

Message: Could not load file or assembly 'Castle.Windsor, Version=3.3.0.0, Culture=neutral, PublicKeyToken=407dd0808d44fbdc' or one of its dependencies. Failed to grant minimum permission requests. (Exception from HRESULT: 0x80131417)

StackTrace:    at System.Web.Compilation.BuildManager.ReportTopLevelCompilationException()
   at System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled()
   at System.Web.Compilation.BuildManager.CallAppInitializeMethod()
   at System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters)
   at System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters)
   at System.Web.Hosting.ApplicationManager.CreateAppDomainWithHostingEnvironment(String appId, IApplicationHost appHost, HostingEnvironmentParameters hostingParameters)
   at System.Web.Hosting.ApplicationManager.CreateAppDomainWithHostingEnvironmentAndReportErrors(String appId, IApplicationHost appHost, HostingEnvironmentParameters hostingParameters)

InnerException: System.Configuration.ConfigurationErrorsException

Message: Could not load file or assembly 'Castle.Windsor, Version=3.3.0.0, Culture=neutral, PublicKeyToken=407dd0808d44fbdc' or one of its dependencies. Failed to grant minimum permission requests. (Exception from HRESULT: 0x80131417)

StackTrace:    at System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective)
   at System.Web.Configuration.CompilationSection.LoadAllAssembliesFromAppDomainBinDirectory()
   at System.Web.Configuration.CompilationSection.LoadAssembly(AssemblyInfo ai)
   at System.Web.Configuration.AssemblyInfo.get_AssemblyInternal()
   at System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection compConfig)
   at System.Web.Compilation.BuildProvidersCompiler..ctor(VirtualPath configPath, Boolean supportLocalization, String outputAssemblyName)
   at System.Web.Compilation.ApplicationBuildProvider.GetGlobalAsaxBuildResult(Boolean isPrecompiledApp)
   at System.Web.Compilation.BuildManager.CompileGlobalAsax()
   at System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled()