L5Swagger API Execute result will return 419 Error - page expired

I integrated my api with L5swagger https://github.com/DarkaOnLine/L5-Swagger

I setup it successfully. When i execute my API code via on L5-swagger. It will gives 419 error -page expired.

http://127.0.0.1:8000/api/documentation

I attached screenshot - https://i.snipboard.io/PLTlFu.jpg