[0]3D项目打包APK遇到的问题

打成APK后报错如下

源码如下
   this.numberCav = Laya.Browser.createElement("canvas"),
            this.numberCav.width = 256,
            this.numberCav.height = 128,
            this.numberCxt = this.numberCav.getContext("2d"),
            this.numberCxt.fillStyle = "rgb(255,255,255)",
            this.numberCxt.font = "bold 70px 黑体",
            this.numberCxt.textAlign = "center",
            this.numberCxt.textBaseline = "middle",
            this.numberTex = new Laya.Texture2D(128, 128),
            this.numberTex.loadImageSource(this.numberCav),