I'm trying to find a sitter, logged in to my own account, and the message "someone is already using that phone number" pops up! It won't let me send messages and I can't find a way to "contact" anyone???

Please help! I am logged in to my own account, but it won't let me send any messages out because it says my phone number is already being used. I am the only one with this phone number (or I would be getting a lot of strange phone calls...!). Please help!!

Thanks! Heidi