SoapUI version 5.4.0 integrated with maven

I can execute clean/compile the source code from release-5.4.0 branch. Then, I can run SoapUi.main(). However, during making package of SoapUI installer, it shows the following message. 

[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building SoapUI installer 5.4.0
[INFO] ------------------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.450 s
[INFO] Finished at: 2017-12-27T13:37:57-08:00
[INFO] Final Memory: 9M/245M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project soapui-installer: Could not resolve dependencies for project com.smartbear.soapui:soapui-installer:jar:5.4.0: Failed to collect dependencies at com.smartbear.soapui:soapui:jar:5.4.0: Failed to read artifact descriptor for com.smartbear.soapui:soapui:jar:5.4.0: Failure to find com.smartbear.soapui:soapui-project:pom:5.4.0 in http://www.soapui.org/repository/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of smartbear-sweden-repository has elapsed or updates are forced -> [Help 1]
[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/DependencyResolutionException