error:
       … while calling the 'getAttr' builtin

         at /builtin/derivation.nix:19:19: (source not available)

       … while calling the 'derivationStrict' builtin

         at /builtin/derivation.nix:9:12: (source not available)

       … while evaluating derivation 'devops-shell'
         whose name attribute is located at /nix/store/p7iz0r8gs6ppkhj83zjmwyd21k8b7v3y-source/pkgs/stdenv/generic/make-derivation.nix:300:7

       … while evaluating attribute 'nativeBuildInputs' of derivation 'devops-shell'

         at /nix/store/p7iz0r8gs6ppkhj83zjmwyd21k8b7v3y-source/pkgs/stdenv/generic/make-derivation.nix:344:7:

          343|       depsBuildBuild              = lib.elemAt (lib.elemAt dependencies 0) 0;
          344|       nativeBuildInputs           = lib.elemAt (lib.elemAt dependencies 0) 1;
             |       ^
          345|       depsBuildTarget             = lib.elemAt (lib.elemAt dependencies 0) 2;

       … while evaluating derivation 'start-cluster'
         whose name attribute is located at /nix/store/p7iz0r8gs6ppkhj83zjmwyd21k8b7v3y-source/pkgs/stdenv/generic/make-derivation.nix:300:7

       … while evaluating attribute 'text' of derivation 'start-cluster'

         at /nix/store/p7iz0r8gs6ppkhj83zjmwyd21k8b7v3y-source/pkgs/build-support/trivial-builders/default.nix:148:16:

          147|     runCommand name
          148|       { inherit text executable checkPhase allowSubstitutes preferLocalBuild;
             |                ^
          149|         passAsFile = [ "text" ];

       … while evaluating derivation 'workbench-profile-default-bage'
         whose name attribute is located at /nix/store/p7iz0r8gs6ppkhj83zjmwyd21k8b7v3y-source/pkgs/stdenv/generic/make-derivation.nix:300:7

       … while evaluating attribute 'generatorService' of derivation 'workbench-profile-default-bage'

         at /nix/store/vf575ibvxifcggqyllrv8vcvk2v5akpk-source/nix/workbench/profile/profile.nix:172:15:

          171|                     }));
          172|               generatorService =
             |               ^
          173|                 with generator-service;

       … while evaluating derivation 'generator-run-script.json'
         whose name attribute is located at /nix/store/p7iz0r8gs6ppkhj83zjmwyd21k8b7v3y-source/pkgs/stdenv/generic/make-derivation.nix:300:7

       … while evaluating attribute 'buildCommand' of derivation 'generator-run-script.json'

         at /nix/store/p7iz0r8gs6ppkhj83zjmwyd21k8b7v3y-source/pkgs/build-support/trivial-builders/default.nix:87:14:

           86|       enableParallelBuilding = true;
           87|       inherit buildCommand name;
             |              ^
           88|       passAsFile = [ "buildCommand" ]

       … from call site

         at /nix/store/vf575ibvxifcggqyllrv8vcvk2v5akpk-source/nix/workbench/service/generator.nix:140:12:

          139|         JSON  = jsonFilePretty "generator-run-script.json"
          140|           (service.decideRunScript service);
             |            ^
          141|       };

       … while calling 'merge'

         at /nix/store/p7iz0r8gs6ppkhj83zjmwyd21k8b7v3y-source/lib/types.nix:640:9:

          639|       merge = loc: defs:
          640|         fnArgs: (mergeDefinitions (loc ++ [ "<function body>" ]) elemType (map (fn: { inherit (fn) file; value = fn.value fnArgs; }) defs)).mergedValue;
             |         ^
          641|       getSubOptions = prefix: elemType.getSubOptions (prefix ++ [ "<function body>" ]);

       … while calling anonymous lambda

         at /nix/store/p7iz0r8gs6ppkhj83zjmwyd21k8b7v3y-source/lib/modules.nix:822:28:

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

       … while evaluating definitions from `<unknown-file>':

       … from call site

         at /nix/store/p7iz0r8gs6ppkhj83zjmwyd21k8b7v3y-source/lib/modules.nix:823:137:

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

       … while calling 'dischargeProperties'

         at /nix/store/p7iz0r8gs6ppkhj83zjmwyd21k8b7v3y-source/lib/modules.nix:894:25:

          893|   */
          894|   dischargeProperties = def:
             |                         ^
          895|     if def._type or "" == "merge" then

       … from call site

         at /nix/store/p7iz0r8gs6ppkhj83zjmwyd21k8b7v3y-source/lib/types.nix:640:114:

          639|       merge = loc: defs:
          640|         fnArgs: (mergeDefinitions (loc ++ [ "<function body>" ]) elemType (map (fn: { inherit (fn) file; value = fn.value fnArgs; }) defs)).mergedValue;
             |                                                                                                                  ^
          641|       getSubOptions = prefix: elemType.getSubOptions (prefix ++ [ "<function body>" ]);

       … while calling 'defaultDecideRunScript'

         at /nix/store/vf575ibvxifcggqyllrv8vcvk2v5akpk-source/nix/nixos/tx-generator-service.nix:62:5:

           61|   defaultDecideRunScript =
           62|     cfg: with cfg;
             |     ^
           63|       __toJSON

       … while calling 'g'

         at /nix/store/p7iz0r8gs6ppkhj83zjmwyd21k8b7v3y-source/lib/attrsets.nix:599:19:

          598|           g =
          599|             name: value:
             |                   ^
          600|             if isAttrs value && cond value

       … from call site

         at /nix/store/p7iz0r8gs6ppkhj83zjmwyd21k8b7v3y-source/lib/attrsets.nix:602:20:

          601|               then recurse (path ++ [name]) value
          602|               else f (path ++ [name]) value;
             |                    ^
          603|         in mapAttrs g;

       … while calling anonymous lambda

         at /nix/store/p7iz0r8gs6ppkhj83zjmwyd21k8b7v3y-source/lib/modules.nix:242:72:

          241|           # For definitions that have an associated option
          242|           declaredConfig = mapAttrsRecursiveCond (v: ! isOption v) (_: v: v.value) options;
             |                                                                        ^
          243|

       … while evaluating the option `services.tx-generator.localNodeSocketPath':

       … while calling anonymous lambda

         at /nix/store/p7iz0r8gs6ppkhj83zjmwyd21k8b7v3y-source/lib/modules.nix:822:28:

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

       … while evaluating definitions from `<unknown-file>':

       … from call site

         at /nix/store/p7iz0r8gs6ppkhj83zjmwyd21k8b7v3y-source/lib/modules.nix:823:137:

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

       … while calling 'dischargeProperties'

         at /nix/store/p7iz0r8gs6ppkhj83zjmwyd21k8b7v3y-source/lib/modules.nix:894:25:

          893|   */
          894|   dischargeProperties = def:
             |                         ^
          895|     if def._type or "" == "merge" then

       … while calling anonymous lambda

         at /nix/store/p7iz0r8gs6ppkhj83zjmwyd21k8b7v3y-source/lib/attrsets.nix:816:24:

          815|     let f = attrPath:
          816|       zipAttrsWith (n: values:
             |                        ^
          817|         let here = attrPath ++ [n]; in

       … from call site

         at /nix/store/vf575ibvxifcggqyllrv8vcvk2v5akpk-source/nix/workbench/profile/profile.nix:135:19:

          134|             let nodeSpecsValue = __fromJSON (__readFile nodeSpecsJson);
          135|             in if backend.validateNodeSpecs { inherit nodeSpecsValue; }
             |                   ^
          136|               then nodeSpecsValue

       … while calling 'validateNodeSpecs'

         at /nix/store/vf575ibvxifcggqyllrv8vcvk2v5akpk-source/nix/workbench/backend/supervisor.nix:29:23:

           28|
           29|   validateNodeSpecs = { nodeSpecsValue }:
             |                       ^
           30|     builtins.all (r: r == "loopback")

       … from call site

         at /nix/store/vf575ibvxifcggqyllrv8vcvk2v5akpk-source/nix/workbench/backend/supervisor.nix:31:8:

           30|     builtins.all (r: r == "loopback")
           31|       (lib.attrsets.mapAttrsToList
             |        ^
           32|         (name: value: value.region)

       … while calling 'mapAttrsToList'

         at /nix/store/p7iz0r8gs6ppkhj83zjmwyd21k8b7v3y-source/lib/attrsets.nix:542:5:

          541|     # Attribute set to map over.
          542|     attrs:
             |     ^
          543|     map (name: f name attrs.${name}) (attrNames attrs);

       error: 1 dependencies of derivation '/nix/store/y874q4ziz7i59pd4bmpc80xjw604mi0l-node-specs-default-bage.json.drv' failed to build