Service Bus for windows server 1.1 powershell

I'm trying to update the admin and tenant site credentials for my service bus for windows server 1.1 farm with three nodes.

I've followed the instructions here... https://msdn.microsoft.com/en-us/library/dn520958.aspx

but when i get the the line about [RunOnAllNodes] Update-SBHost I get the following error in powershell 

At line:1 char:17
+ [RunOnAllNodes] Update-SBHost
+                 ~~~~~~~~~~~~~
Unexpected token 'Update-SBHost' in expression or statement.
    + CategoryInfo          : ParserError: (:) [], ParentContainsErrorRecordEx
   ception
    + FullyQualifiedErrorId : UnexpectedToken