Could not find module "@angular-devkit/build-angular" from "/home/Projects/myProjectName".
Error: Could not find module "@angular-devkit/build-angular" from "/home/Projects/myProjectName".
    at Object.resolve (/home/Projects/myProjectName/node_modules/@angular-devkit/core/node/resolve.js:141:11)
    at Observable.rxjs_1.Observable [as _subscribe] (/home/Projects/myProjectName/node_modules/@angular-devkit/architect/src/architect.js:132:40)

ng update说一切都井然有序.删除node_modules文件夹和新的npm安装安装也没有帮助.

我的项目基于[ng2-admin(Angular4版本)].(https://github.com/akveo/ngx-admin)这是我的package.json dependecies：

"dependencies": {
    "@angular/animations": "^6.0.1","@angular/common": "^6.0.1","@angular/compiler": "^6.0.1","@angular/core": "^6.0.1","@angular/forms": "^6.0.1","@angular/http": "^6.0.1","@angular/platform-browser": "^6.0.1","@angular/platform-browser-dynamic": "^6.0.1","@angular/platform-server": "^6.0.1","@angular/router": "^6.0.1","@ng-bootstrap/ng-bootstrap": "1.0.0-alpha.26","@ngx-translate/core": "^10.0.1","@ngx-translate/http-loader": "^3.0.1","amcharts3": "github:amcharts/amcharts3","ammap3": "github:amcharts/ammap3","angular-table": "^1.0.4","angular2-csv": "^0.2.5","angular2-datatable": "0.6.0","animate.css": "3.5.2","bootstrap": "4.0.0-alpha.6","bower": "^1.8.4","chart.js": "1.1.1","chartist": "0.10.1","chroma-js": "1.3.3","ckeditor": "4.6.2","core-js": "2.4.1","easy-pie-chart": "2.1.7","font-awesome": "4.7.0","fullcalendar": "3.3.1","google-maps": "3.2.1","ionicons": "2.0.1","jquery": "3.2.1","jquery-slimscroll": "1.3.8","leaflet": "0.7.7","leaflet-map": "0.2.1","lodash": "4.17.4","ng2-ckeditor": "1.1.6","ng2-completer": "^1.6.3","ng2-handsontable": "^2.1.0-rc.3","ng2-slim-loading-bar": "^4.0.0","ng2-smart-table": "^1.0.3","ng2-tree": "2.0.0-alpha.5","ngx-uploader": "4.2.4","normalize.css": "6.0.0","roboto-fontface": "0.7.0","rxjs": "^6.1.0","rxjs-compat": "^6.1.0","zone.js": "0.8.26"
  },"devDependencies": {
    "@angular/cli": "^6.0.1","@angular/compiler-cli": "^6.0.1","@types/fullcalendar": "2.7.40","@types/jasmine": "2.5.38","@types/jquery": "2.0.41","@types/jquery.slimscroll": "1.3.30","@types/lodash": "4.14.61","@types/node": "6.0.69","codelyzer": "3.0.1","gh-pages": "0.12.0","jasmine-core": "2.5.2","jasmine-spec-reporter": "3.2.0","karma": "1.4.1","karma-chrome-launcher": "2.0.0","karma-cli": "1.0.1","karma-coverage-istanbul-reporter": "0.2.0","karma-jasmine": "1.1.0","karma-jasmine-html-reporter": "0.2.2","npm-run-all": "4.0.2","protractor": "5.1.0","rimraf": "2.6.1","standard-changelog": "1.0.1","stylelint": "7.10.1","ts-node": "2.1.2","tslint": "5.2.0","tslint-eslint-rules": "4.0.0","tslint-language-service": "0.9.6","typescript": "^2.7.2","typogr": "0.6.6","underscore": "1.8.3","wintersmith": "2.2.5","wintersmith-sassy": "1.1.0"
  }

和我的angular.json：

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json","version": 1,"newProjectRoot": "projects","projects": {
    "ng2-admin": {
      "root": "","sourceRoot": "src","projectType": "application","architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser","options": {
            "outputPath": "dist","index": "src/index.html","main": "src/main.ts","tsConfig": "src/tsconfig.app.json","polyfills": "src/polyfills.ts","assets": [
              "src/assets","src/favicon.ico"
            ],"styles": [
              "node_modules/roboto-fontface/css/roboto/sass/roboto-fontface.scss","node_modules/normalize.css/normalize.css","node_modules/font-awesome/scss/font-awesome.scss","node_modules/ionicons/scss/ionicons.scss","node_modules/bootstrap/scss/bootstrap.scss","node_modules/leaflet/dist/leaflet.css","node_modules/chartist/dist/chartist.css","node_modules/fullcalendar/dist/fullcalendar.css","node_modules/handsontable/dist/handsontable.full.css","node_modules/ng2-slim-loading-bar/style.css","src/app/theme/theme.scss","src/styles.scss"
            ],"scripts": [
              "node_modules/jquery/dist/jquery.js","node_modules/easy-pie-chart/dist/jquery.easypiechart.js","node_modules/jquery-slimscroll/jquery.slimscroll.js","node_modules/tether/dist/js/tether.js","node_modules/bootstrap/dist/js/bootstrap.js","node_modules/handsontable/dist/handsontable.full.js","node_modules/chroma-js/chroma.js"
            ]
          },"configurations": {
            "production": {
              "optimization": true,"outputHashing": "all","sourceMap": false,"extractCss": true,"namedChunks": false,"aot": true,"extractLicenses": true,"vendorChunk": false,"buildOptimizer": true,"fileReplacements": [
                {
                  "replace": "src/environments/environment.ts","with": "src/environments/environment.prod.ts"
                }
              ]
            }
          }
        },"serve": {
          "builder": "@angular-devkit/build-angular:dev-server","options": {
            "browserTarget": "ng2-admin:build"
          },"configurations": {
            "production": {
              "browserTarget": "ng2-admin:build:production"
            }
          }
        },"extract-i18n": {
          "builder": "@angular-devkit/build-angular:extract-i18n","options": {
            "browserTarget": "ng2-admin:build"
          }
        },"test": {
          "builder": "@angular-devkit/build-angular:karma","options": {
            "main": "src/test.ts","karmaConfig": "./karma.conf.js","tsConfig": "src/tsconfig.spec.json","node_modules/chroma-js/chroma.js"
            ],"src/favicon.ico"
            ]
          }
        },"lint": {
          "builder": "@angular-devkit/build-angular:tslint","options": {
            "tsConfig": [
              "src/tsconfig.app.json","src/tsconfig.spec.json"
            ],"exclude": []
          }
        }
      }
    },"ng2-admin-e2e": {
      "root": "","sourceRoot": "","architect": {
        "e2e": {
          "builder": "@angular-devkit/build-angular:protractor","options": {
            "protractorConfig": "./protractor.conf.js","devServerTarget": "ng2-admin:serve"
          }
        },"options": {
            "tsConfig": [
              "e2e/tsconfig.e2e.json"
            ],"exclude": []
          }
        }
      }
    }
  },"defaultProject": "ng2-admin","schematics": {
    "@schematics/angular:component": {
      "prefix": "app","styleext": "scss"
    },"@schematics/angular:directive": {
      "prefix": "app"
    }
  }
}