Replace 'problem fetching data' error with detailed error about failure
Replace 'problem fetching data' error with detailed error about failure

Also sends an Error instance

wsw0108/Windshaft,wsw0108/Windshaft,CartoDB/Windshaft,wsw0108/Windshaft,manueltimita/Windshaft,HydroLogic/Windshaft,CartoDB/Windshaft,manueltimita/Windshaft,CartoDB/Windshaft,HydroLogic/Windshaft,HydroLogic/Windshaft,manueltimita/Windshaft