运行demo出错

下载demo运行出错，信息如下：
项目 'epii-camera_0.0.3_example' 编译成功。
14:04:47.222 正在建立手机连接...
14:04:47.358 手机端调试基座版本号为3.1.2，版本号相同，跳过基座更新
14:04:47.450 正在同步手机端程序文件...
14:04:47.563 同步手机端程序文件完成
14:04:47.684 正在启动HBuilder调试基座...
14:04:48.915 应用【chajian_test】已启动...
14:04:48.987 App Launch at App.vue:4
14:04:49.010 App Show at App.vue:7
14:04:50.905 TypeError: this.$refs.camera.openCamera is not a function
14:04:53.942 TypeError: this.$refs.camera.openCamera is not a function
14:04:55.507 TypeError: this.$refs.camera.takePicture is not a function
14:04:56.564 TypeError: this.$refs.camera.startRecord is not a function