spring boot Whitelabel Error Page

Appears when spring Boot is running
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Sat Feb 16 00:12:17 CST 2019
There was an unexpected error (type=Not Found, status=404).
No message available
Here’s my solution
The Application startup class is not in the right place. To place the Application class on the outermost side, it contains all subpackages
reason :spring-boot automatically loads all components under the package where the startup class is located and under its subpackages.

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