selection-change not working sketch 64
hello , i run the examples/selection-changed plugin in sketch 64 not working. in dev-tools return errors,like above

<img width="987" alt="屏幕快照 2020-04-29 下午4 24 34" src="https://user-images.githubusercontent.com/1013557/80575308-f403a200-8a35-11ea-8ff4-048141c194ef.png">
