Powershell DFS - adding new DFS member

Hi

Is anyone out there currently experiencing the error below when adding new DFS member using new-dfsrmember cmdlet? 

PS C:\> New-DfsrMember -ComputerName WEBSERVER -ReplicationGroup POD1
New-DfsrMember : Cannot process argument transformation on parameter 'ReplicationGroup'. Cannot convert the "POD1" value of type
"System.String" to type "Mwcc.Management.Dfs.DfsrReplicationGroup".
At line:1 char:63
+ New-DfsrMember -ComputerName WEBSERVER -ReplicationGroup POD1
+                                                          ~~~~
    + CategoryInfo          : InvalidData: (:) [New-DfsrMember], ParameterBindingArgumentTransformationException
    + FullyQualifiedErrorId : ParameterArgumentTransformationError,New-DfsrMember
 

I couldn't find anything out there that could help.

Appreciated if anyone can help.