Forbidden - No mutable databases available

[paluigi]

I just installed datasette with pipx (Ubuntu 22.04), and I injected datasette-upload-csvs with:
pipx inject datasette datasette-upload-csvs

Then I launch datasette with root permissions
datasette --root
and click on the link with the token.

If I try to navigate to the /-/upload-csvs link I get the 403 error:
Forbidden - No mutable databases available

What am I doing wrong? Is there any setting I should change to upload csvs?

It is a fresh datasette instance, it has not database except _memory

Thanks,
Luigi