title: Callback was already called angular cli
body: <p>I updated my angular-cli then i got error in ng serve</p>
  
  <pre><code> Callback was already called.
  at throwError (node_modules\neo-async\async.js:14:11)
  at node_modules\neo-async\async.js:2805:7
  at _combinedTickCallback (internal/process/next_tick.js:131:7)
  at process._tickCallback (internal/process/next_tick.js:180:9)
  </code></pre>
  
  <p>and this is versions of my project packages:</p>
  
  <pre><code>Angular CLI: 6.0.7
  Node: 8.9.4
  OS: win32 x64
  Angular: 5.0.1
  
  Package                           Version
  -----------------------------------------------------------
  @angular-devkit/architect         0.6.7
  @angular-devkit/build-angular     0.6.7
  @angular-devkit/build-optimizer   0.6.7
  @angular-devkit/core              0.6.7
  @angular-devkit/schematics        0.6.7
  @angular/cdk                      5.2.4
  @angular/cli                      6.0.7
  @angular/material                 5.2.4
  @angular/platform-server          5.1.1
  @ngtools/webpack                  6.0.7
  @schematics/angular               0.6.7
  @schematics/update                0.6.7
  rxjs                              5.5.2
  typescript                        2.4.2
  webpack                           4.4.1
  </code></pre>
  
  <p>I tried to remove node-modules then re- npm install but still have the same error ... any suggestions ?</p>