I believe it only happens if you have a Manifest.toml file, and it’s kind of in the way, and you can move it out of the way be renaming it (maybe you’re even ok with deleting, I’m just unsure when it might have critical info for your project that you might want to preserve; myself I’ve never had to):
mv Manifest.toml Manifest.toml_old_in_the_way
in your current directory, if you were using a project there, you can also point to a fresh project directly, or if you’re not using one, then you might move the relevant file in the .julia directory…