Unfortunately, you've upgraded your "firebase" dependency to 8.0.0 but the "firebaseui" dependency doesn't support it yet. You will have to temporarily downgrade firebase to version 7.24.0 until firebaseui supports the [breaking changes in 8.0.0][1].

[1]: https://firebase.google.com/support/release-notes/js#version_800_-_october_26_2020

Unfortunately, you've upgraded your "firebase" dependency to 8.0.0 but the "firebaseui" dependency doesn't support it yet. You will have to temporarily downgrade firebase to version 7.24.0 until firebaseui and react-firebaseui support the [breaking changes in 8.0.0][1].

[1]: https://firebase.google.com/support/release-notes/js#version_800_-_october_26_2020