Can't use gltfloader.js because of dracoloader problem

I imported gltfloader.js well, and have problem in

	THREE.DRACOLoader.setDecoderPath( './examples/js/libs/draco' );

above parts saying

(index):115 Uncaught TypeError: Cannot read property ‘setDecoderPath’ of undefined
at init ((index):115)
at (index):84

and have problem in

	THREE.DRACOLoader is null.

I can’t find any initialize process…and put draco folder well on ./examples/js/libs/draco


Have you actually imported THREE.DRACOLoader into you app?