javascript - Cannot read property 'length' of undefined by loading object in Three.js -


i'm quite beginner in three.js. tried load simple cylinder.js object exported blender. but, got error

uncaught typeerror: cannot read property 'length' of undefined three.js:600 three.loader.initmaterials three.js:600 three.jsonloader.createmodel three.js:691 g.onreadystatechange

here's simple code 

var scene = new three.scene(); var camera = new three.perspectivecamera(      75,      window.innerwidth / window.innerheight,      0.1,      1000 );  camera.position.z = 300; scene.add(camera); var renderer = new three.webglrenderer(); renderer.setsize( window.innerwidth, window.innerheight ); var loader = new three.jsonloader();  function createscene( geometry )  {     var materials = geometry.materials[0];     materials.morphtargets = true;     var material = new three.meshfacematerial();     mesh = new three.mesh( geometry, material );     mesh.scale.set(50, 50, 50);     scene.add( mesh ); }                               loader.load('cylinder.js', createscene)

i don't have idea should do. appreciate idea , help.


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