Error signing up in demo site

[bscaspar]

When attempting to sign up in the demo site I get the following error:

errorMessage: {
 "code": "ResourceNotFoundException",
 "name": "ResourceNotFoundException",
 "message": "User pool client mqf1hekas6mvbbsst9ffne1nt does not exist."
}

[hhemmati81]

I also get this error as well every time I push an update to my git. If you delete the app and create a new one from the git repo then it works fine until the next push.