Angular 2 Cannot read property 'config' of null

Question

I have a issue with Angular 2. When i want to start server it get this:

$ ng serve
Cannot read property 'config' of null
TypeError: Cannot read property 'config' of null
at Class.run (C:\Users\Damien\Desktop\application\node_modules\@angul ar\cli\tasks\serve.js:22:63)
at check_port_1.checkPort.then.port (C:\Users\Damien\Desktop\application\node_modules\@angular\cli\commands\serve.js:103:26)
at process._tickCallback (internal/process/next_tick.js:103:7)

I reinstalled CLI and nothing else is working. I could be something with json file?

Answer 1

I found the solution! In my case I moved the project to another directory.
there is a hidden file called .angular-cli
Show the hidden file in the old project and copy this file and paste it in the new distention. This solved the issue for me.

Answer 2

Probably you remove project into other folder, or delete .angular-cli.json

Into the root of your app, add: .angular-cli.json

and paste:

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "project": {
    "name": "PROJECT_NAME"
  },
  "apps": [
    {
      "root": "src",
      "outDir": "dist",
      "assets": [
        "assets",
        "favicon.ico"
      ],
      "index": "index.html",
      "main": "main.ts",
      "polyfills": "polyfills.ts",
      "test": "test.ts",
      "tsconfig": "tsconfig.app.json",
      "testTsconfig": "tsconfig.spec.json",
      "prefix": "app",
      "styles": [
        "styles.css"
      ],
      "scripts": [],
      "environmentSource": "environments/environment.ts",
      "environments": {
        "dev": "environments/environment.ts",
        "prod": "environments/environment.prod.ts"
      }
    }
  ],
  "e2e": {
    "protractor": {
      "config": "./protractor.conf.js"
    }
  },
  "lint": [
    {
      "project": "src/tsconfig.app.json"
    },
    {
      "project": "src/tsconfig.spec.json"
    },
    {
      "project": "e2e/tsconfig.e2e.json"
    }
  ],
  "test": {
    "karma": {
      "config": "./karma.conf.js"
    }
  },
  "defaults": {
    "styleExt": "css",
    "component": {}
  }
}

Answer 3

Please add following file at root folder File Name-.angular-cli.json

{
    "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
    "project": {
        "name": "XXXX"
    },
    "apps": [
        {
            "root": "src",
            "outDir": "dist",
            "assets": [
                "assets",
                "favicon.ico"
            ],
            "index": "index.html",
            "main": "main.ts",
            "polyfills": "polyfills.ts",
            "test": "test.ts",
            "tsconfig": "tsconfig.app.json",
            "testTsconfig": "tsconfig.spec.json",
            "prefix": "app",
            "styles": [
                "assets/css/styles.css"

            ],
            "scripts": [
                "assets/js/project.js"      

            ],
            "environmentSource": "environments/environment.ts",
            "environments": {
                "dev": "environments/environment.ts",
                "prod": "environments/environment.prod.ts"
            }
        }
    ],
    "e2e": {
        "protractor": {
            "config": "./protractor.conf.js"
        }
    },
    "lint": [
        {
            "project": "src/tsconfig.app.json"
        },
        {
            "project": "src/tsconfig.spec.json"
        },
        {
            "project": "e2e/tsconfig.e2e.json"
        }
    ],
    "test": {
        "karma": {
            "config": "./karma.conf.js"
        }
    },
    "defaults": {
        "styleExt": "css",
        "component": {}
    }
}

Answer 4

you missing .angular-cli.json,

you can generate it by(go to a new folder)

 ng new project-name

now copy .angular-cli.json file to your project root.

 ng serve 

the error should be gone.