Mill resolve error

[srishti-sr]

I am trying to run the rocket-chip code using nix environment but i am getting these errors.Further in intellij ide i am getting a problem in executing bsp and facing this error: error: experimental Nix feature 'nix-command' is disabled; add '--extra-experimental-features nix-command' to enable it. And the following error trying to run rocketchip code: arushisharma@Arushis-MacBook-Air ~ % nix-shell -p cowsay lolcat

[nix-shell:~]$ cd rocket-chip

[nix-shell:~/rocket-chip]$ mill rocket-chip No mill version specified. You should provide a version via '.mill-version' file or --mill-version option. Using mill version 0.11.7 [build.sc] [47/53] zincReportCachedProblems Cannot resolve rocket-chip. Did you mean rocketchip?

[nix-shell:~/rocket-chip]$ mi;; rocketchip bash: syntax error near unexpected token `;;'

[nix-shell:~/rocket-chip]$ mill rocketchip No mill version specified. You should provide a version via '.mill-version' file or --mill-version option. Using mill version 0.11.7 [build.sc] [47/53] zincReportCachedProblems Cannot find default task to evaluate for module rocketchip

I am using MacOS apple chip,mill version:11.0.7 and nix installed version:2.21.0.

[sequencer]

The Rocket Chip currently uses nix to configure the build and/or development environment, you need to install it first depending on your OS distro.