I'm doing some active directory work with c# and I'm getting this error on my page

```
System.IO.FileNotFoundException: Could not load file or assembly 'Interop.ActiveDs, Version=1.0.0.0, Culture=neutral, PublicKeyToken=46db4b78e98e1c9d' or one of its dependencies. The system cannot find the file specified.

```

It's having some issue with the ActiveDS reference that was added
I'm on a 64-bit machine and the server it runs on is also x64

I added the ActiveDS reference so I could do something like this

```
newRoleGroup.Properties["groupType"].Value = ActiveDs.ADS_GROUP_TYPE_ENUM.ADS_GROUP_TYPE_UNIVERSAL_GROUP;

```

So my question is, why can't it load the ActiveDs reference?