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Can no longer rebuild - now to debug this?

$ sudo nixos-rebuild build --show-trace
building Nix...
error: while evaluating the attribute 'config' at /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/lib/eval-config.nix:64:5:
while evaluating the attribute 'config' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:96:25:
...
user/root/channels/nixos/lib/modules.nix:195:9:
while evaluating 'addMeta' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:173:19, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:195:18:
value is a function while a set was expected, at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:195:27

here are the channels

$ sudo nix-channel --list
nixos https://nixos.org/channels/nixos-20.03
nixos-unstable https://nixos.org/channels/nixos-unstable
nixpkgs https://nixos.org/channels/nixpkgs-unstable

and tried clearing sudo rm -rf /nix/var/nix/profiles/per-user/root/ to no effect

John Fremlin
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  • Could you post the full stack trace? The current lines don't provide much context. You could also try to comment out some of your recent additions and/or post the relevant parts of your configuration. – Robert Hensing Aug 17 '20 at 02:45
  • here's the whole trace https://gist.github.com/vii/31d1e2f9d33405132c89a4899fe2eb61 - I'll try and comment out bits of my config; I was confused as that is never mentioned – John Fremlin Aug 18 '20 at 03:10
  • @JohnFremlin have you tried updating your channels ? with `sudo nix-channel --update ` . – Stephane Rolland Aug 20 '20 at 18:40

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