Azure PowerShell - Object reference not set to an instance of an object -

i'm trying write powershell script automate eventhub creation using azure powershell. following documentation outlined here , have installed azure powershell module (v 1.0.3).

i have added microsoft servicebus library (v3.0) using following

$scriptpath = split-path -parent $pscommandpath $dllpath = "$scriptpath\..\..\packages\windowsazure.servicebus.3.1.2\lib\net45-full\microsoft.servicebus.dll" add-type -path $dllpath 

but try , use get-azuresbnamespace command, e.g.

$currentnamespace = get-azuresbnamespace -name $namespace 

i following error

get-azuresbnamespace : object reference not set instance of object. 

the same true of new-azuresbnamespace. have tried logging azure within same session using login-azurermaccount, same object null reference exception.

is bug, or missing not outlined in documentation?

this because uses service management api , not resource manager api. me ran:

add-azureaccount 

and get-azuresbnamespace , other sb cmdlets started working fine.