title: After upgrading to Angular 5 Compile error
body: <p>I upgraded the project to latest stable Angular 5.0.0 from 4.0.2, With that, I updated all other dependencies as well.
  (I am not sure if I should first upgrade to 4.4.6, Making Angular project working along with all dependencies is really become pain :(( )
  Now when I run <code>ng serve</code> I am getting following error: </p>
  
  <pre><code>chunk {inline} inline.bundle.js (inline) 5.79 kB [entry] [rendered]
  chunk {main} main.bundle.js (main) 2.93 kB [initial] [rendered]
  chunk {polyfills} polyfills.bundle.js (polyfills) 636 bytes [initial] [rendered]
  chunk {styles} styles.bundle.js (styles) 2.4 MB [initial] [rendered]
  chunk {vendor} vendor.bundle.js (vendor) 853 kB [initial] [rendered]
  
  ERROR in Error: Could not resolve module ./users/users.module.ts relative to /Users/username/Projects/project-name/src/app/routes/routes.module.ts
  at StaticSymbolResolver.getSymbolByModule (/Users/username/Projects/project-name/node_modules/@angular/compiler/bundles/compiler.umd.js:31826:30)
  at StaticReflector.resolveExternalReference (/Users/username/Projects/project-name/node_modules/@angular/compiler/bundles/compiler.umd.js:30292:62)
  at parseLazyRoute (/Users/username/Projects/project-name/node_modules/@angular/compiler/bundles/compiler.umd.js:28577:55)
  at listLazyRoutes (/Users/username/Projects/project-name/node_modules/@angular/compiler/bundles/compiler.umd.js:28539:36)
  at visitLazyRoute (/Users/username/Projects/project-name/node_modules/@angular/compiler/bundles/compiler.umd.js:29937:47)
  at AotCompiler.listLazyRoutes (/Users/username/Projects/project-name/node_modules/@angular/compiler/bundles/compiler.umd.js:29905:20)
  at AngularCompilerProgram.listLazyRoutes (/Users/username/Projects/project-name/node_modules/@angular/compiler-cli/src/transformers/program.js:157:30)
  at Function.NgTools_InternalApi_NG_2.listLazyRoutes (/Users/username/Projects/project-name/node_modules/@angular/compiler-cli/src/ngtools_api.js:44:36)
  at AngularCompilerPlugin._getLazyRoutesFromNgtools (/Users/username/Projects/project-name/node_modules/@ngtools/webpack/src/angular_compiler_plugin.js:246:66)
  at Promise.resolve.then.then (/Users/username/Projects/project-name/node_modules/@ngtools/webpack/src/angular_compiler_plugin.js:542:50)
  at process._tickCallback (internal/process/next_tick.js:109:7)
  </code></pre>
  
  <p>I looked into the <a href="https://github.com/angular/angular/blob/master/CHANGELOG.md" rel="nofollow noreferrer">Angular 5 change log</a>, I don't see any change I need to make.</p>
  
  <p>I have already updated all dependencies.</p>
  
  <p>I looked for the error but didn't find much about it. Please share if any one run into similar issue and there is any better solution for upgrading angular 5.0.0</p>
  
  <pre><code>  "dependencies": {
          "@agm/core": "^1.0.0-beta.2",
          "@angular/animations": "^5.0.0",
          "@angular/common": "^5.0.0",
          "@angular/compiler": "^5.0.0",
          "@angular/core": "^5.0.0",
          "@angular/forms": "^5.0.0",
          "@angular/http": "^5.0.0",
          "@angular/platform-browser": "^5.0.0",
          "@angular/platform-browser-dynamic": "^5.0.0",
          "@angular/platform-server": "^5.0.0",
          "@angular/router": "^5.0.0",
          "@asymmetrik/ngx-leaflet": "^2.5.1",
          "@ngx-translate/core": "^8.0.0",
          "@ngx-translate/http-loader": "2.0.0",
          "@toverux/ngsweetalert2": "^2.0.1",
          "@types/leaflet": "^1.2.1",
          "ag-grid": "^14.0.1",
          "ag-grid-angular": "^14.0.0",
          "angular-2-dropdown-multiselect": "^1.6.0",
          "angular-tree-component": "^5.1.2",
          "angular2-datatable": "^0.6.0",
          "angular2-jwt": "^0.2.3",
          "angular2-text-mask": "^8.0.0",
          "angular2-toaster": "^4.0.1",
          "bootstrap": "^3.3.7",
          "chart.js": "^2.5.0",
          "classlist.js": "^1.1.20150312",
          "codemirror": "5.31.0",
          "core-js": "2.5.1",
          "easy-pie-chart": "2.1.7",
          "flot": "flot/flot#v0.8.3",
          "font-awesome": "4.7.0",
          "fullcalendar": "3.6.2",
          "intl": "1.2.5",
          "jqcloud2": "2.0.3",
          "jquery": "3.2.1",
          "jquery-slimscroll": "1.3.8",
          "jquery-sparkline": "2.4.0",
          "jquery.browser": "0.1.0",
          "jquery.flot.tooltip": "github:krzysu/flot.tooltip",
          "leaflet": "^1.2.0",
          "lodash": "4.17.4",
          "modernizr": "3.5.0",
          "moment": "2.19.1",
          "ng2-charts": "1.6.0",
          "ng2-dnd": "4.2.0",
          "ng2-file-upload": "1.2.1",
          "ng2-img-cropper": "0.9.0",
          "ng2-select": "1.2.0",
          "ng2-table": "1.3.2",
          "ng2-tag-input": "1.4.1",
          "ng2-validation": "4.2.0",
          "ngx-bootstrap": "^2.0.0-beta.8",
          "ngx-color-picker": "4.5.0",
          "ngx-infinite-scroll": "0.6.1",
          "node-sass": "^4.6.0",
          "rxjs": "^5.5.0",
          "screenfull": "3.3.2",
          "simple-line-icons": "2.4.1",
          "spinkit": "1.2.5",
          "summernote": "0.8.8",
          "sweetalert": "2.0.8",
          "sweetalert2": "^6.11.2",
          "ts-helpers": "1.1.2",
          "tslib": "^1.8.0",
          "weather-icons": "github:erikflowers/weather-icons",
          "web-animations-js": "2.3.1",
          "webpack": "^3.8.1",
          "zone.js": "0.8.18"
        },  
  
  
  "devDependencies": {
          "@angular/cli": "^1.3.1",
          "@angular/compiler-cli": "^5.0.0",
          "@types/codemirror": "0.0.50",
          "@types/jasmine": "2.6.3",
          "@types/lodash": "4.14.82",
          "@types/node": "8.0.49",
          "codelyzer": "4.0.1",
          "jasmine-core": "2.8.0",
          "jasmine-spec-reporter": "4.2.1",
          "karma": "1.7.1",
          "karma-chrome-launcher": "2.2.0",
          "karma-cli": "1.0.1",
          "karma-coverage-istanbul-reporter": "1.3.0",
          "karma-jasmine": "1.1.0",
          "karma-jasmine-html-reporter": "0.2.2",
          "karma-read-json": "1.1.0",
          "loaders.css": "0.1.2",
          "napa": "3.0.0",
          "protractor": "5.2.0",
          "ts-node": "3.3.0",
          "tslint": "5.8.0",
          "typescript": "2.4.2",
          "uglifyjs-webpack-plugin": "^1.0.1",
          "webdriver-manager": "12.0.6"
        }
  </code></pre>