```
[root:/home/shyim]# nix-channel --update
unpacking channels...
error: error parsing derivation '/nix/store/5xb0m39k7bxwiy2xjqmk558wi77fmn37-nixos-19.09pre191505.7d5375ebf4c.drv': expected string 'Derive(['
error: program '/nix/store/s2p31z7jw75a74iwqkq0bilsji41rrqx-nix-2.2.2/bin/nix-env' failed with exit code 1
```