Angular 2 : No NgModule metadata found

The problem is in your main.ts file.

const platform = platformBrowserDynamic();
platform.bootstrapModule(App);

You are trying to bootstrap App, which is not a real module. Delete these two lines and replace with the following line:

platformBrowserDynamic().bootstrapModule(AppModule);

and it will fix your error.

I had this error even though I had everything that the answers above suggested in place. A simple edit in the app.module.ts file ( like delete a bracket and put it back) did the trick.

After upgrading to Angular 6, I encountered the "ERROR in No NgModule metadata found for 'AppModule'." with the angular-bootstrap-md package, which requires a tsconfig.json "include" as follows:

"include": ["node_modules/angular-bootstrap-md/**/*.ts", "src/**/*.ts"],

After days of troubleshooting and hair pulling, the solution was to arrange the list so that the app.module.ts was located first, under "src/**/*.ts". An Angular bug, perhaps?

"include": ["src/**/*.ts","node_modules/angular-bootstrap-md/**/*.ts" ],

I genuinely hope this helps somebody, as I tried everything in this posting and nothing helped. After this change, everything compiles and works beautifully, as expected.

Try to remove node_modules rm -rf node_modules and package-lock.json rm -rf package-lock.json, after that run npm install.