This problem bothered me for a while. What I want to say is that I couldn’t find the problem when deploying springboot through Maven. Therefore, after quickly arranging a springboot project, I found that the error will still be reported

So I looked at this version number and added it in and it worked
   <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
<version>2.5.3</version>
            </plugin>
        </plugins>
    </build>