Can the main branch be complied correctly?

[yuqi1129]

mvn clean package
[INFO] Scanning for projects...
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[ERROR] Child module /Users/x/project/galaxysql/polardbx-rpc/pom.xml of /Users/x/project/galaxysql/pom.xml does not exist @ 
 @ 
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]   
[ERROR]   The project com.alibaba.polardbx:polardbx:5.4.12-SNAPSHOT (/Users/x/project/galaxysql/pom.xml) has 1 error
[ERROR]     Child module /Users/x/project/galaxysql/polardbx-rpc/pom.xml of /Users/x/project/galaxysql/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

[free6om]

update submodule after cloning galaxysql: git submodule update --init