I see a Datasource not found exception. I am trying to use an api's json response:

public function settings()
    {
        $client = new \GuzzleHttp\Client();
        $res = $client->get('http://someApiCall');
        $apiarray = json_decode($res->getBody()->getContents());        
        return array(
            "dataSource"=>array(
                "apiarray"=>array(
                    "class"=>'\koolreport\datasources\ArrayDataSource',
                    "dataFormat"=>"associate",
                )
            )
        );
    }

That one worked. Thank you. Now I am getting Class 'App\Reports\Sort' not found and Class 'App\Reports\Group' not found

function setup()
    {
        $this->src('apiarray')
        ->pipe(new Group(array(
            "by"=>"some_column"
        )))
        ->pipe(new Sort(array(
            "some_column"=>"desc"
        )))
        ->pipe(new Limit(array(10)))
        ->pipe($this->dataStore('myDataStore'));        
    }