Yeah, I had the same issue yesterday when trying to login to facebook messenger it says error. Turns out it was a server-side glitch. Check Downdetector (https://downdetector.com/) to see if others are reporting it too.
If it’s just you, try logging in from a different device or network. Sometimes that weirdly fixes it.
If it’s just you, try logging in from a different device or network. Sometimes that weirdly fixes it.