Can not add domain groups to local groups on member server

Member server is joined to my domain. Member server is windows 2008 r2 standard 64bit. My AD is windows 2008 R2 enterprise.

On my member server I need to add Domain Users group to the Local Administrators group.

Opened the properties of the Administrators Group and Clicked add. Then clicked Advanced... and I get a error "The advanced page cannot be opened because of the following error: The network path was not found." Even if I enter Domain Users in the box and click ok, the name is not found. I can map network drives to the domain controller but any time I try to access domain users or groups I get that error.

The member server is also my Terminal Services server with RemoteApp installed.
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Is the member server a domain member? It sounds like it is a Workgroup Computer.
CyrunAuthor Commented:
First thing I checked and it states it's a domain member. member.PNG

Here is a screen shot of the error message I'm getting.
CyrunAuthor Commented:
Here are the screen shots in JPG formate.
 The Error Message Showing network membership
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Try re-adding your machine to the local domain and re-boot. Also make sure you are using a Domain administrators account  to do this. I would also Check to see if all your other machines are using the .local domain extension.

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CyrunAuthor Commented:
Removed server from the domain, rebooted, joined it back to the domain, rebooted and all is working normally.
Glad to hear that my solution worked
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