How to defeat MethodAccessException in Unity?

Hello everyone!

I wrote a small code to initialize the ICS under Windows. But alas, I ran into one problem...
when I execute the line:

netSharingManager = Activator.CreateInstance (type);

- an exception occurs:
MethodAccessException: Method `System.__ComObject..ctor()' is inaccessible from method `System.__ComObject..ctor()'
System.__ComObject..ctor () (at <e392dcd9fc5b44f3b60850d757273e30>:0)
(wrapper cominterop-invoke) System.__ComObject..ctor()
System.Reflection.MonoCMethod.InternalInvoke (System.Object obj, System.Object[] parameters) (at <e1a80661d61443feb3dbdaac88eeb776>:0)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoCMethod.InternalInvoke (System.Object obj, System.Object[] parameters) (at <e1a80661d61443feb3dbdaac88eeb776>:0)
System.RuntimeType.CreateInstanceMono (System.Boolean nonPublic) (at <e1a80661d61443feb3dbdaac88eeb776>:0)
System.RuntimeType.CreateInstanceSlow (System.Boolean publicOnly, System.Boolean skipCheckThis, System.Boolean fillCache, System.Threading.StackCrawlMark& stackMark) (at <e1a80661d61443feb3dbdaac88eeb776>:0)
System.RuntimeType.CreateInstanceDefaultCtor (System.Boolean publicOnly, System.Boolean skipCheckThis, System.Boolean fillCache, System.Threading.StackCrawlMark& stackMark) (at <e1a80661d61443feb3dbdaac88eeb776>:0)
System.Activator.CreateInstance (System.Type type, System.Boolean nonPublic) (at <e1a80661d61443feb3dbdaac88eeb776>:0)
System.Activator.CreateInstance (System.Type type) (at <e1a80661d61443feb3dbdaac88eeb776>:0)
AnotherWifi.Hotspot.Init () (at Assets/Scripts/NewHotSpot/Hotspot.cs:20)


Current program code:

Code (CSharp):

1. public class Hotspot
2. {
3.     [DllImport("ole32.dll")]
4.     static extern int CLSIDFromProgID([MarshalAs(UnmanagedType.LPWStr)] string
5.         lpszProgID, out Guid pclsid);
6.      
7.     private dynamic netSharingManager = null;
8.      
9.     public Hotspot()
10.     {
11.         Init();
12.     }
13.  
14.     private void Init()
15.     {
16.         Guid g = Guid.Empty;
17.         CLSIDFromProgID("HNetCfg.HNetShare.1", out g);
18.      
19.         var type = Type.GetTypeFromCLSID(g);
20.         netSharingManager = Activator.CreateInstance(type);
21.     }
22. }

I could not find a solution to this problem. Can anyone know how to deal with this?
Thank you!