Why am I getting an 'unexpected error occurred please try logging in again' message on Facebook Android?

This error on Facebook Android often indicates a problem with your internet connection, a corrupted cache, or a software glitch. It can also be due to issues on Facebook's servers. Try checking your internet connectivity, clearing the app's cache and data, updating the Facebook app, or restarting your phone. If the problem persists, Facebook's servers might be temporarily down.