building the system configuration...
error: attribute 'pulse' missing

       at /nix/var/nix/profiles/per-user/root/channels/nixos-unstable/nixos/modules/services/desktops/pipewire/pipewire.nix:159:57:

          158|     systemd.packages = [ cfg.package ]
          159|                        ++ lib.optional cfg.pulse.enable cfg.package.pulse;
             |                                                         ^
          160|

       … while evaluating the attribute 'package.pulse'

       … while evaluating the attribute 'value'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/types.nix:271:40:

          270|                 elemType
          271|                 [{ inherit (def) file; value = def'; }]
             |                                        ^
          272|               ).optionalValue

       … while evaluating 'dischargeProperties'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:549:25:

          548|   */
          549|   dischargeProperties = def:
             |                         ^
          550|     if def._type or "" == "merge" then

       … from call site

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:478:137:

          477|         defs' = concatMap (m:
          478|           map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))
             |                                                                                                                                         ^
          479|         ) defs;

       … while evaluating definitions from `/nix/var/nix/profiles/per-user/root/channels/nixos-unstable/nixos/modules/services/desktops/pipewire/pipewire.nix':

       … while evaluating anonymous lambda

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:477:28:

          476|         # Process mkMerge and mkIf properties.
          477|         defs' = concatMap (m:
             |                            ^
          478|           map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))

       … from call site

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:477:17:

          476|         # Process mkMerge and mkIf properties.
          477|         defs' = concatMap (m:
             |                 ^
          478|           map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))

       … while evaluating the attribute 'values'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:590:7:

          589|     in {
          590|       values = concatMap (def: if getPrio def == highestPrio then [(strip def)] else []) defs;
             |       ^
          591|       inherit highestPrio;

       … while evaluating the attribute 'values'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:491:9:

          490|       in {
          491|         values = defs''';
             |         ^
          492|         inherit (defs'') highestPrio;

       … while evaluating the attribute 'optionalValue'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:509:5:

          508|
          509|     optionalValue =
             |     ^
          510|       if isDefined then { value = mergedValue; }

       … while evaluating anonymous lambda

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/types.nix:267:23:

          266|           if isList def.value then
          267|             imap1 (m: def':
             |                       ^
          268|               (mergeDefinitions

       … from call site

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/lists.nix:116:32:

          115|   */
          116|   imap1 = f: list: genList (n: f (n + 1) (elemAt list n)) (length list);
             |                                ^
          117|

       … while evaluating anonymous lambda

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/lists.nix:116:29:

          115|   */
          116|   imap1 = f: list: genList (n: f (n + 1) (elemAt list n)) (length list);
             |                             ^
          117|

       … from call site

       … while evaluating anonymous lambda

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/types.nix:265:35:

          264|       merge = loc: defs:
          265|         map (x: x.value) (filter (x: x ? value) (concatLists (imap1 (n: def:
             |                                   ^
          266|           if isList def.value then

       … from call site

       … while evaluating 'merge'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/types.nix:264:20:

          263|       check = isList;
          264|       merge = loc: defs:
             |                    ^
          265|         map (x: x.value) (filter (x: x ? value) (concatLists (imap1 (n: def:

       … from call site

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:499:59:

          498|       if isDefined then
          499|         if all (def: type.check def.value) defsFinal then type.merge loc defsFinal
             |                                                           ^
          500|         else let firstInvalid = findFirst (def: ! type.check def.value) null defsFinal;

       … while evaluating the attribute 'mergedValue'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:497:5:

          496|     # Type-check the remaining definitions, and merge them. Or throw if no definitions.
          497|     mergedValue =
             |     ^
          498|       if isDefined then

       … while evaluating the option `systemd.packages':

       … while evaluating the attribute 'value'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:465:9:

          464|     in warnDeprecation opt //
          465|       { value = builtins.addErrorContext "while evaluating the option `${showOption loc}':" value;
             |         ^
          466|         inherit (res.defsFinal') highestPrio;

       … while evaluating anonymous lambda

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:98:72:

           97|           # For definitions that have an associated option
           98|           declaredConfig = mapAttrsRecursiveCond (v: ! isOption v) (_: v: v.value) options;
             |                                                                        ^
           99|

       … from call site

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/attrsets.nix:279:20:

          278|               then recurse (path ++ [name]) value
          279|               else f (path ++ [name]) value;
             |                    ^
          280|         in mapAttrs g set;

       … while evaluating 'g'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/attrsets.nix:276:19:

          275|           g =
          276|             name: value:
             |                   ^
          277|             if isAttrs value && cond value

       … from call site

       … while evaluating the attribute 'packages'

       … while evaluating the attribute 'buildCommand' of the derivation 'system-units'

       at /nix/store/427mv9b9ifysk1cb6kf2vgwq1v9mxcd6-nixos-20.09.3613.34f85de51bb/nixos/pkgs/build-support/trivial-builders.nix:7:7:

            6|     stdenv.mkDerivation ({
            7|       name = lib.strings.sanitizeDerivationName name;
             |       ^
            8|       inherit buildCommand;

       … while evaluating 'check'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/types.nix:256:15:

          255|       name = "path";
          256|       check = x: isCoercibleToString x && builtins.substring 0 1 (toString x) == "/";
             |               ^
          257|       merge = mergeEqualOption;

       … from call site

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:499:22:

          498|       if isDefined then
          499|         if all (def: type.check def.value) defsFinal then type.merge loc defsFinal
             |                      ^
          500|         else let firstInvalid = findFirst (def: ! type.check def.value) null defsFinal;

       … while evaluating anonymous lambda

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:499:17:

          498|       if isDefined then
          499|         if all (def: type.check def.value) defsFinal then type.merge loc defsFinal
             |                 ^
          500|         else let firstInvalid = findFirst (def: ! type.check def.value) null defsFinal;

       … from call site

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:499:12:

          498|       if isDefined then
          499|         if all (def: type.check def.value) defsFinal then type.merge loc defsFinal
             |            ^
          500|         else let firstInvalid = findFirst (def: ! type.check def.value) null defsFinal;

       … while evaluating the attribute 'mergedValue'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:497:5:

          496|     # Type-check the remaining definitions, and merge them. Or throw if no definitions.
          497|     mergedValue =
             |     ^
          498|       if isDefined then

       … while evaluating the option `environment.etc.systemd/system.source':

       … while evaluating the attribute 'value'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:465:9:

          464|     in warnDeprecation opt //
          465|       { value = builtins.addErrorContext "while evaluating the option `${showOption loc}':" value;
             |         ^
          466|         inherit (res.defsFinal') highestPrio;

       … while evaluating anonymous lambda

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:98:72:

           97|           # For definitions that have an associated option
           98|           declaredConfig = mapAttrsRecursiveCond (v: ! isOption v) (_: v: v.value) options;
             |                                                                        ^
           99|

       … from call site

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/attrsets.nix:279:20:

          278|               then recurse (path ++ [name]) value
          279|               else f (path ++ [name]) value;
             |                    ^
          280|         in mapAttrs g set;

       … while evaluating 'g'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/attrsets.nix:276:19:

          275|           g =
          276|             name: value:
             |                   ^
          277|             if isAttrs value && cond value

       … from call site

       … while evaluating the attribute 'source'

       … while evaluating anonymous lambda

       at /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/system/etc/etc.nix:20:20:

           19|     /* !!! Use toXML. */
           20|     sources = map (x: x.source) etc';
             |                    ^
           21|     targets = map (x: x.target) etc';

       … from call site

       … while evaluating the attribute 'sources' of the derivation 'etc'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/system/etc/etc.nix:12:5:

           11|   etc = pkgs.stdenvNoCC.mkDerivation {
           12|     name = "etc";
             |     ^
           13|

       … while evaluating the attribute 'value'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:338:44:

          337|       defnsByName' = byName "config" (module: value:
          338|           [{ inherit (module) file; inherit value; }]
             |                                            ^
          339|         ) configs;

       … while evaluating 'dischargeProperties'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:549:25:

          548|   */
          549|   dischargeProperties = def:
             |                         ^
          550|     if def._type or "" == "merge" then

       … from call site

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:478:137:

          477|         defs' = concatMap (m:
          478|           map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))
             |                                                                                                                                         ^
          479|         ) defs;

       … while evaluating definitions from `/nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/system/etc/etc.nix':

       … while evaluating anonymous lambda

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:477:28:

          476|         # Process mkMerge and mkIf properties.
          477|         defs' = concatMap (m:
             |                            ^
          478|           map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))

       … from call site

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:477:17:

          476|         # Process mkMerge and mkIf properties.
          477|         defs' = concatMap (m:
             |                 ^
          478|           map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))

       … while evaluating the attribute 'values'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:590:7:

          589|     in {
          590|       values = concatMap (def: if getPrio def == highestPrio then [(strip def)] else []) defs;
             |       ^
          591|       inherit highestPrio;

       … while evaluating the attribute 'values'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:491:9:

          490|       in {
          491|         values = defs''';
             |         ^
          492|         inherit (defs'') highestPrio;

       … while evaluating the attribute 'mergedValue'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:497:5:

          496|     # Type-check the remaining definitions, and merge them. Or throw if no definitions.
          497|     mergedValue =
             |     ^
          498|       if isDefined then

       … while evaluating the option `system.activationScripts.etc.text':

       … while evaluating the attribute 'value'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:465:9:

          464|     in warnDeprecation opt //
          465|       { value = builtins.addErrorContext "while evaluating the option `${showOption loc}':" value;
             |         ^
          466|         inherit (res.defsFinal') highestPrio;

       … while evaluating anonymous lambda

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:98:72:

           97|           # For definitions that have an associated option
           98|           declaredConfig = mapAttrsRecursiveCond (v: ! isOption v) (_: v: v.value) options;
             |                                                                        ^
           99|

       … from call site

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/attrsets.nix:279:20:

          278|               then recurse (path ++ [name]) value
          279|               else f (path ++ [name]) value;
             |                    ^
          280|         in mapAttrs g set;

       … while evaluating 'g'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/attrsets.nix:276:19:

          275|           g =
          276|             name: value:
             |                   ^
          277|             if isAttrs value && cond value

       … from call site

       … while evaluating the attribute 'text'

       … while evaluating the attribute 'text'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/system/activation/activation-script.nix:9:5:

            8|   addAttributeName = mapAttrs (a: v: v // {
            9|     text = ''
             |     ^
           10|       #### Activation script snippet ${a}:

       … while evaluating 'id'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/trivial.nix:14:5:

           13|     # The value to return
           14|     x: x;
             |     ^
           15|

       … from call site

       … while evaluating 'textClosureMap'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/strings-with-deps.nix:70:35:

           69|
           70|   textClosureMap = f: predefined: names:
             |                                   ^
           71|     concatStringsSep "\n" (map f (textClosureList predefined names));

       … from call site

       at /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/system/activation/activation-script.nix:101:18:

          100|                 withHeadlines = addAttributeName set';
          101|               in textClosureMap id (withHeadlines) (attrNames withHeadlines)
             |                  ^
          102|             }

       … while evaluating the attribute 'system.activationScripts.script'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/system/activation/activation-script.nix:80:9:

           79|       apply = set: {
           80|         script =
             |         ^
           81|           ''

       … while evaluating the attribute 'activationScript' of the derivation 'nixos-system-basil-hallward-20.09.3613.34f85de51bb'

       at /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/system/activation/top-level.nix:95:5:

           94|   baseSystem = pkgs.stdenvNoCC.mkDerivation {
           95|     name = "nixos-system-${config.system.name}-${config.system.nixos.label}";
             |     ^
           96|     preferLocalBuild = true;