[pgrouting-users] Help me - nothing appear on my map

Hi everybody. I try since many weeks to run correctly the workshop instruction (http://workshop.pgrouting.org/ ) but i am always blocked .

Now ts ok with Postgis functions. But as you can see on the screenshots attached to this mail, always nothing on the map after i put/move the two point on it.

Now I get :


it's the output of the last line of the php file :  echo json_encode($geojson);