error:
       … while evaluating the attribute 'config'

         at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:322:9:

          321|         options = checked options;
          322|         config = checked (removeAttrs config [ "_module" ]);
             |         ^
          323|         _module = checked (config._module);

       … while calling the 'seq' builtin

         at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:322:18:

          321|         options = checked options;
          322|         config = checked (removeAttrs config [ "_module" ]);
             |                  ^
          323|         _module = checked (config._module);

       (stack trace truncated; use '--show-trace' to show the full trace)

       error: undefined variable 'RECEIVING_CORNER_RADIUS'

       at /etc/nixos/configuration.nix:732:21:

          731|                  box-shadow: 0px 0px 0px 60px black, 0px 0px 0px 0.5px #ebdbb2;
          732|                   border-radius: ${RECEIVING_CORNER_RADIUS}px;
             |                     ^
          733|                        margin: 20px;
building Nix...
error:
       … while evaluating the attribute 'config'

         at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:322:9:

          321|         options = checked options;
          322|         config = checked (removeAttrs config [ "_module" ]);
             |         ^
          323|         _module = checked (config._module);

       … while calling the 'seq' builtin

         at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:322:18:

          321|         options = checked options;
          322|         config = checked (removeAttrs config [ "_module" ]);
             |                  ^
          323|         _module = checked (config._module);

       (stack trace truncated; use '--show-trace' to show the full trace)

       error: undefined variable 'RECEIVING_CORNER_RADIUS'

       at /etc/nixos/configuration.nix:732:21:

          731|                  box-shadow: 0px 0px 0px 60px black, 0px 0px 0px 0.5px #ebdbb2;
          732|                   border-radius: ${RECEIVING_CORNER_RADIUS}px;
             |                     ^
          733|                        margin: 20px;
building the system configuration...
error:
       … while evaluating the attribute 'config.system.build.toplevel'

         at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:322:9:

          321|         options = checked options;
          322|         config = checked (removeAttrs config [ "_module" ]);
             |         ^
          323|         _module = checked (config._module);

       … while calling the 'seq' builtin

         at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:322:18:

          321|         options = checked options;
          322|         config = checked (removeAttrs config [ "_module" ]);
             |                  ^
          323|         _module = checked (config._module);

       (stack trace truncated; use '--show-trace' to show the full trace)

       error: undefined variable 'RECEIVING_CORNER_RADIUS'

       at /etc/nixos/configuration.nix:732:21:

          731|                    box-shadow: 0px 0px 0px 60px black, 0px 0px 0px 0.5px #ebdbb2;
          732|                   border-radius: ${RECEIVING_CORNER_RADIUS}px;
             |                     ^
          733|                        margin: 20px;