Has your Birdseye subscription expired? If so and you try to send anything from Basecamp to your device, you would get that message.
It is important to back up files from gps after you have sent them (copy the .jnx files back to another folder on your computer). These files have already been unlocked for your GPS and will continue to work even if your subscription expires. But once the subscription expires you can't send Birdseye from Basecamp anymore.