title: I can't run Angular server I replace angular.json file and I get the same error
body: <p>I can't run Angular server - I tried to figure out the problem and I can't get it</p>
  
  <blockquote>
    <p>An unhandled exception occurred: Workspace config file cannot le loaded: F:\me\angular test\angtest\angular.json</p>
    
    <p>Schema validation failed with the following errors:<br>
    Data path "" should NOT have additional properties(project).</p>
    
    <p>See "C:\Users\chetos\AppData\Local\Temp\ng-eg8i0c\angular-errors.log" for further details. </p>
    
    <p>PS F:\me\angular test\angtest> ng s
    Your global Angular CLI version (8.1.1) is greater than your local
    version (8.0.6). The local Angular CLI version is used.</p>
    
    <p>To disable this warning use "ng config -g cli.warnings.versionMismatch false".
    Could not find the implementation for builder @angular-devkit/build-angular:dev-server</p>
    
    <p>Error: Could not find the implementation for builder @angular-devkit/build-angular:dev-server</p>
    
    <p>at WorkspaceNodeModulesArchitectHost.resolveBuilder (F:\me\angular test\angtest\node_modules@angular-devkit\architect\node\node-modules-architect-host.js:49:19)<br>
    at ServeCommand.initialize (F:\me\angular test\angtest\node_modules@angular\cli\models\architect-command.js:135:55)<br>
    at process._tickCallback (internal/process/next_tick.js:68:7)<br>
    at Function.Module.runMain (internal/modules/cjs/loader.js:832:11)<br>
    at startup (internal/bootstrap/node.js:283:19)<br>
    at bootstrapNodeJSCore (internal/bootstrap/node.js:622:3)</p>
  </blockquote>