出现于异常404

出现于异常404，热部署成功，但是自动重新加载后页面就404

页面信息如下：

Whitelabel Error Page

This application has no explicit mapping for /error, so you are seeing this as a fallback.

Sat Aug 31 11:40:17 CST 2019

There was an unexpected error (type=Not Found, status=404).

No message available

求解