nixbot

failed to register gcroot /var/lib/nixbot/eval-gcroots/723/inputs/6cdjhw0ia5rvskrw5i3ynnzyzlagyn6s-source -> /nix/store/6cdjhw0ia5rvskrw5i3ynnzyzlagyn6s-source: warning: unknown setting 'eval-cores'
warning: unknown setting 'lazy-trees'
don't know how to build these paths:
  /nix/store/6cdjhw0ia5rvskrw5i3ynnzyzlagyn6s-source
error: path '/nix/store/6cdjhw0ia5rvskrw5i3ynnzyzlagyn6s-source' is required, but there is no substituter that can build it