THREE.WebGLRenderer: Error creating WebGL context.

[pengMaster]

THREE.WebGLRenderer: Error creating WebGL context. console.error @ VM111:1 WebGLRenderer @ three.js:21448 restart @ main.js? [sm]:34 Main @ main.js? [sm]:29 (anonymous) @ game.js? [sm]:6 require @ WAGame.js:3 (anonymous) @ gamePage.html:124 VM111:1 gameThirdScriptError Cannot read property 'getExtension' of null TypeError: Cannot read property 'getExtension' of null at Object.get (http://127.0.0.1:34644/game/js/libs/three.js:20889:21) at initGLContext (http://127.0.0.1:34644/game/js/libs/three.js:21464:15) at new WebGLRenderer (http://127.0.0.1:34644/game/js/libs/three.js:21510:3) at Main.restart (http://127.0.0.1:34644/game/js/main.js:55:18) at new Main (http://127.0.0.1:34644/game/js/main.js:48:10) at http://127.0.0.1:34644/game/game.js:13:1 at require (http://127.0.0.1:34644/game/dev/WAGame.js:3:14317) at http://127.0.0.1:34644/game/gamePage.html:124:5