maven项目启动时报错，好像是编译错误

Question

[INFO] Scanning for projects...
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[WARNING] 'dependencies.dependency.(groupId:artifactId:type:classifier)' must be unique: commons-logging:commons-logging:jar -> version 1.1.3 vs 1.1.1 @ line 245, column 15
[ERROR] Child module F:\workspaces-itcast\appshop\appshop-parent\appshop-web of F:\workspaces-itcast\appshop\appshop-parent\pom.xml does not exist @
@
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]

[ERROR] The project com.baidu:appshop-parent:0.0.1-SNAPSHOT (F:\workspaces-itcast\appshop\appshop-parent\pom.xml) has 1 error
[ERROR] Child module F:\workspaces-itcast\appshop\appshop-parent\appshop-web of F:\workspaces-itcast\appshop\appshop-parent\pom.xml does not exist
[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
大神求帮忙

Answer 1

groupId:artifactId:type:classifier)' must be unique: commons-logging 标识号必须唯一
Child module F:\workspaces-itcast\appshop\appshop-parent\appshop-web of F:\workspaces-itcast\appshop\appshop-parent\pom.xml does not exist XML中引用的子module不存在