There was an error once I imported Mirror 2022.9.15. Is there something wrong with the Mirror Package or is it only me?
I am using Unity 2020.3.40f1 and Unity Hub 3.2.0.
(This error also occurred when I used Unity 2021.3.8f1.),
I am working on a mirror game and came across the same issue, here is the fix: Instead of importing the package from the unity editor download the mirror source code from GitHub and drag it into unity.