What exact login error are you getting? Can you take a screenshot?
How can i update my persona theme
Hello, the package info for nodebb uses a specific version of persona, meaning NPM will not update it for you, nor will nodebb start if you manually download an updated version. This is likely because breaking changes occur often in the theme, and preventing manual updates prevents breaking your forum.
If you think your persona is outdated, updating nodebb itself will update persona to the latest recommended version.