pom parent child module error. error in plugin

 <build>

    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

Error in this section from parent is due to the fact that target is already build without 

this. Target folder should be deleted then it will be ok.