Samsung Galaxy Note 4, Message not sent error yet messages are being recieved

I've tried a bunch of the things other threads have said, restarting, deleting cache, deleting old messages, downloading handcent SMS, deleting Facebook, nothing seems to work.

I can even text myself, the text gets received before the app says it failed!

This is incredibly frustrating and I'd really rather not have to do a factory reset, was just wondering if I could get some help.

Thanks! I'm hoping it goes away on its own, but I doubt it will. Will update if it does though.

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