It appears that there is, in fact, no Slingbox associated with the email address you are using. It sounds like you did not complete the setup at the home location which you will need to do before watching your Slingbox at a remote location, Here are some articles to assist you with setting up the Slingbox:
If you need any assistance setting up your M1, or SlingTV you can contact Sling support via phone at 1-877-467-5464. If it is any older unit, we may have to acquire a proof of purchase and establish a warranty before assisting. Please keep in mind that setup should be done at the Slingbox location.
Hope we hear from you!
Sling Media Moderator Team