Use non-laravel package league/csv in laravel 5

I am trying to use the composer package league/csv in laravel 5.

In my controller there is the following use statement:

use League\Csv\Reader;

Then there is the following function:

public function import (Request $request)
{
    if ($request->isMethod('post'))
    {
        $validatedData = $request->validate([
            'csv' => 'required|mimetypes:text/comma-separated-values,text/plain|mimes:csv,txt',
        ]);

        if ($request->file('csv') && $request->file('csv')->isValid())
        {
            $file = $request->csv->path();

            $csv = new Reader($file);
            echo'<pre>';var_dump($csv);exit;

        }
    }
}

The reader is loaded but I got the following error message:

Call to protected League\Csv\AbstractCsv::__construct() from context 'App\Http\Controllers\MyController'

via Chebli Mohamed