react-native 新手求助

最近接手 rn 项目，遇到不解的问题，intellj 不到错，但是 Android 模拟器报错：
undefined is not an object(evaluating 'MediaPickerView.Type')
代码：
export default class MediaPickerView extends PureComponent {
static Type = {
Image: 1,
Video: 2,
}

static propTypes = {
navigation: PropTypes.object.isRequired,
onLoadSuccess: PropTypes.func,
multiSelect: PropTypes.bool,
mediaType: PropTypes.number,
}

static defaultProps = {
multiSelect: true,
mediaType: MediaPickerView.Type.Image,
}
......
}