Unable to get data object using doctrine through api, when 'web' middleware is not attached

When I am making a API call to the http://localhost/lvl53/public/api/getSongs using Postman I get the following error.

FatalErrorException Doctrine\Common\Proxy\AbstractProxyFactory::getProxyDefinition(): Failed opening required.

http://ift.tt/2v34bBZ

Here are my routes web.php

Route::get('/', function () {
    return view('welcome');
});

Auth::routes();
Route::group(['middleware' => ['web','auth']], function () {
    Route::get('/song', 'SongController@index')->name('song');
    Route::get('/addSong', 'SongController@addSong')->name('addNewSong');
    Route::post('/registerSong', 'SongController@create')->name('registerSong');

});

Route::get('/home', 'HomeController@index')->name('home');

Here is api.php

Route::middleware('auth:api')->get('/user', function (Request $request) {
    return $request->user();
});

Route::group(['middleware' => ['test']], function () {
    Route::get('/getSongs', 'SongController@getSongs')->name('getSongs');
});

But if I add the API route getSongs to the Route::Group in web.php and after logging in make the call, then I am able to retrieve data.

Here's my SongController's getSongs method

public function getSongs(EntityManagerInterface $em)
    {
        $songs = $em->getRepository(SongEntity::class)->findAll();
        $songList = [];
        \Log::info(["Songs",$songs]);
        foreach ($songs as $song){
            $currentSong["artist"] = $song->getArtist();
            $currentSong["title"] = $song->getTitle();
            $currentSong["url"] = $song->getUrl();
            array_push($songList, $currentSong);
        }
        return $songList;
        /*return view('song.songs', ['songs' => Song::all()]);*/

    } 

In here when making the api call \Log doesn't create a log. How to retrieve data using the API? PS: When I looked into error msg they say I have do advance configurations on doctrine, it doesn't make sense. Any help is highly appreciated.

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