Spring Boot introduces org.springframework.boot.SpringApplication error

A new spring boot MAVEN project created today,

Write startup class found unable to introduce springapplication,

It was a conflict, I had earlier created the project with a relatively low version of spring boot

, resulting in an older version of the configuration under the PC User folder, now causing the conflict with the new version

, then just delete the conflicting old version, the folder address

C:\Users\hanfuqingshi\.m2\repository\org\springframework\boot\spring-boot

Under the 2.0.0.RELEASE for the new version, while the other for the old version, after removing the old version,

Right-click on the IDE project run As-maven clean in maven install

, and finally Maven-update project.

Spring Boot introduces org.springframework.boot.SpringApplication error