*nixos*.txt

unpacking channels...
building Nix...
building the system configuration...
error: while evaluating the attribute 'activationScript' of the derivation 'nixos-system-mus-20.03.1405.a17e021b948' at /nix/var/nix/profiles/per-user/root/channels/nixpkgs/nixos/modules/system/activation/top-level.nix:103:5:
while evaluating the attribute 'system.activationScripts.script' at /nix/var/nix/profiles/per-user/root/channels/nixpkgs/nixos/modules/system/activation/activation-script.nix:68:9:
while evaluating 'textClosureMap' at /nix/var/nix/profiles/per-user/root/channels/nixpkgs/lib/strings-with-deps.nix:70:35, called from /nix/var/nix/profiles/per-user/root/channels/nixpkgs/nixos/modules/system/activation/activation-script.nix:89:18:
while evaluating 'id' at /nix/var/nix/profiles/per-user/root/channels/nixpkgs/lib/trivial.nix:14:5, called from undefined position:
while evaluating the attribute 'text' at /nix/var/nix/profiles/per-user/root/channels/nixpkgs/nixos/modules/system/activation/activation-script.nix:9:5:
while evaluating the attribute 'text' at /nix/var/nix/profiles/per-user/root/channels/nixpkgs/lib/strings-with-deps.nix:77:38:
while evaluating the attribute 'sources' of the derivation 'etc' at /nix/var/nix/profiles/per-user/root/channels/nixpkgs/nixos/modules/system/etc/etc.nix:12:5:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixpkgs/nixos/modules/system/etc/etc.nix:20:20, called from undefined position:
while evaluating the attribute 'source' at undefined position:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixpkgs/lib/modules.nix:84:45, called from undefined position:
while evaluating the attribute 'value' at /nix/var/nix/profiles/per-user/root/channels/nixpkgs/lib/modules.nix:379:9:
while evaluating the option `environment.etc.crontab.source':
while evaluating the attribute 'mergedValue' at /nix/var/nix/profiles/per-user/root/channels/nixpkgs/lib/modules.nix:411:5:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixpkgs/lib/modules.nix:413:22, called from /nix/var/nix/profiles/per-user/root/channels/nixpkgs/lib/modules.nix:413:9:
while evaluating 'check' at /nix/var/nix/profiles/per-user/root/channels/nixpkgs/lib/types.nix:251:15, called from /nix/var/nix/profiles/per-user/root/channels/nixpkgs/lib/modules.nix:414:14:
while evaluating the attribute 'allFiles' of the derivation 'crontabs' at /nix/store/vkalyc5421xsfhxfki6pd1qv8xw3byad-nixpkgs-20.03.1405.a17e021b948/nixpkgs/pkgs/build-support/trivial-builders.nix:7:14:
while evaluating the attribute 'text' of the derivation 'system-crontab' at /nix/store/vkalyc5421xsfhxfki6pd1qv8xw3byad-nixpkgs-20.03.1405.a17e021b948/nixpkgs/pkgs/build-support/trivial-builders.nix:7:14:
while evaluating the attribute 'passAsFile' of the derivation 'system-path' at /nix/store/vkalyc5421xsfhxfki6pd1qv8xw3byad-nixpkgs-20.03.1405.a17e021b948/nixpkgs/pkgs/build-support/trivial-builders.nix:7:14:
while evaluating the attribute 'out.outPath' at /nix/store/vkalyc5421xsfhxfki6pd1qv8xw3byad-nixpkgs-20.03.1405.a17e021b948/nixpkgs/lib/customisation.nix:151:13:
while evaluating the attribute 'propagatedBuildInputs' of the derivation 'vulnix-1.9.4' at /nix/store/vkalyc5421xsfhxfki6pd1qv8xw3byad-nixpkgs-20.03.1405.a17e021b948/nixpkgs/pkgs/development/interpreters/python/mk-python-derivation.nix:105:3:
while evaluating the attribute 'out.outPath' at /nix/store/vkalyc5421xsfhxfki6pd1qv8xw3byad-nixpkgs-20.03.1405.a17e021b948/nixpkgs/lib/customisation.nix:151:13:
while evaluating the attribute 'handled' at /nix/store/vkalyc5421xsfhxfki6pd1qv8xw3byad-nixpkgs-20.03.1405.a17e021b948/nixpkgs/pkgs/stdenv/generic/check-meta.nix:251:7:
while evaluating 'handleEvalIssue' at /nix/store/vkalyc5421xsfhxfki6pd1qv8xw3byad-nixpkgs-20.03.1405.a17e021b948/nixpkgs/pkgs/stdenv/generic/check-meta.nix:147:38, called from /nix/store/vkalyc5421xsfhxfki6pd1qv8xw3byad-nixpkgs-20.03.1405.a17e021b948/nixpkgs/pkgs/stdenv/generic/check-meta.nix:252:14:
Package ‘python3.7-ZODB-5.5.1’ in /nix/store/vkalyc5421xsfhxfki6pd1qv8xw3byad-nixpkgs-20.03.1405.a17e021b948/nixpkgs/pkgs/development/python-modules/zodb/default.nix:61 is marked as broken, refusing to evaluate.

a) For `nixos-rebuild` you can set
  { nixpkgs.config.allowBroken = true; }
in configuration.nix to override this.

b) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
  { allowBroken = true; }
to ~/.config/nixpkgs/config.nix.