Laravel Charts Package: Class '' not found

Larevel Charts 6.3 is the package for chart. I have read docs. 4 times. "there is not Aliases new version 6.3 of package" & my laravel version is 5.6

use Charts;

 $chart = Charts::database($users, 'bar', 'highcharts')

        ->title("Monthly new Register Users")

        ->groupByMonth(date('Y'), true);

ERROR:

Class 'ConsoleTVs\Charts\Facades\Charts' not found

This line in my config/app.php: 'aliases'

via Chebli Mohamed