创建委托会由于签名或安全透明度而引发绑定错误

我正在使用C#4.0和.NET 4.5。

我有这个类，它是当前上下文中的入口点：

public static class HttpConfigurationImporter
        {
            public static readonly string ConfigurationMethodName = "Register";
            public static readonly string ConfigClassName = "WebApiConfig";
            public static readonly string HelpPageConfigClassName = "HelpPageConfig";
            public static HttpConfiguration ImportConfiguration(string assemblyPath)
            {
                var assembly = Assembly.LoadFrom(assemblyPath);
                string originalDirectory = Environment.CurrentDirectory;
                Environment.CurrentDirectory = Path.GetDirectoryName(assemblyPath);
                Type webApiConfigType = assembly
                                  .GetTypes()
                                  .FirstOrDefault(t => t.Name == ConfigClassName);
                MethodInfo registerConfigMethod = webApiConfigType
                    .GetMethod(ConfigurationMethodName
                    , BindingFlags.Static | BindingFlags.Public);
                  //ERROR on this LINE
                  Action<HttpConfiguration> registerConfig = Delegate.
                    CreateDelegate(typeof(Action<HttpConfiguration>), 
                    registerConfigMethod)
                    as Action<HttpConfiguration>;
                HttpConfiguration config = new HttpConfiguration();
                registerConfig(config);
                ImportHelpPageConfiguration(assembly, config);
                Environment.CurrentDirectory = originalDirectory;
                return config;
            }
     }

当我尝试在另一个程序集中为以下目标创建委托时..：

public static class WebApiConfig
    {
        public static void Register(HttpConfiguration configuration)
        {
            configuration.MapHttpAttributeRoutes();
        }
    }

我收到错误：Cannot bind to the target method because its signature or security transparency is not compatible with that of the delegate type.

如何解决这个问题？

//ERROR on this LINE
Action<HttpConfiguration> registerConfig = Delegate.
                    CreateDelegate(typeof(Action<HttpConfiguration>), 
                    registerConfigMethod)
                    as Action<HttpConfiguration>;

registerConfigMethod.Invoke(new object(), new object[] { config });

registerConfig(config);