Maven分模块开发执行指令失败的问题

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Maven工程分模块开发完成 父工程配置了 tomcat7插件，运行 run命令

执行run指令时失败，报错信息如下：

D:\\java\\JDK8\\bin\\java.exe "-Dmaven.multiModuleProjectDirectory=D:\\Idea2020\\IntelliJ IDEA 2020.1\\MavenProject_parent" -Dmaven.home=D:\\apache-maven-3.6.3
-Dclassworlds.conf=D:\\apache-maven-3.6.3\\bin\\m2.conf "
-Dmaven.ext.class.path=D:\\Idea2020\\IntelliJ IDEA 2020.1\\plugins\\maven\\lib\\maven-event-listener.jar" "
-javaagent:D:\\Idea2020\\IntelliJ IDEA 2020.1\\lib\\idea_rt.jar=50388:D:\\Idea2020\\IntelliJ IDEA 2020.1\\bin"
-Dfile.encoding=UTF-8 -classpath D:\\apache-maven-3.6.3\\boot\\plexus
-classworlds-2.6.0.jar;D:\\apache-maven-3.6.3\\boot\\plexus
-classworlds.license org.codehaus.classworlds.Launcher
-Didea.version2020.1 -s D:\\apache-maven-3.6.3\\conf\\settings.xml
-Dmaven.repo.local=D:\\apache-maven-3.6.3\\my_maven_local_repository install
[INFO] Scanning for projects…
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[ERROR] 'modules.module[3]' specifies duplicate child module maven_dao @ line 29, column 17
@
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR] The project com.idea.maven:MavenProject_parent:1.0-SNAPSHOT (D:\\Idea2020\\IntelliJ IDEA 2020.1\\MavenProject_parent\\pom.xml) has 1 error
[ERROR] 'modules.module[3]' specifies duplicate child module maven_dao @ line 29, column 17
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException

分析报错原因：

[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[ERROR] 'modules.module[3]' specifies duplicate child module maven_dao @ line 29, column 17

原因： 在父工程的Pom.xml 文件中，指定了重复了子模块 maven_dao