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Can't you just drag it to the right to get rid of it? That works with most things in notifications.
Can you view the message? It sounds like you have an outgoing message either going to a non-existent recipient or it's somehow corrupt. It might help to reboot your phone if there is a process stuck.
Okay. I think you might try a different angle here. It could be a fake notification associated with some adware. You might want to install Addons detector and see if a recently installed app is doing something behind the scenes.
No addon detected, and I haven't installed any apps recently. Any other suggestions?
At this point a factory reset might be the simplest. Make sure you have backups of all your important data including emails and text messages.
Try going into Settings > Aplications> Find messaging app and clear data