WARNING: No deployment found in service: in Windows Azure

hi while setting a static IP to one of my Azure VM, I got the below warning message.
"WARNING: No deployment found in service: <service name>"
however I was able to do so earlier.
then I realise that I have multiple subscriptions in same login.
so this is issue of subscription.
so before you use the command you must set your subscription for which you wan to work.
get the list of subscriptions you have
Get-AzureSubscription | Select SubscriptionName

now set to the desired subscription
Select-AzureSubscription -SubscriptionName "<Your-Desired-Subscription-Name-Here>"
then use your command.

Regards,
yes.sudhanshu