Help Can't remove " connexion error " notification

[SmilingCookie]

Today I tried login in to youtube, at first I entered my username instead of gmail and of course now I have a notification saying I have a connexion error on this account and I have to enter the password for my " username@youtube.com " account wich of course doesn't exist ! How can I remove the notification ?

 

[SUroot]

App or web? If app, clear data via manage applications?