notification problems

Hi

I ma trying to subscribe to a document, so when it changes I could get the notification..thou it gives this error.

<b>The operation failed: Subscription: couldn't find a valid channel for all recipients</b>

I have added the email smtp server,user,password in sys adm-> sys config-> utilities-> channels-> email

I do not get the recent notifications iview as well.

Do i need to assign this iview to a role?