I want to make the source code into RPM package，but have a question。

[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary for dolphinscheduler 1.2.1:
[INFO]
[INFO] dolphinscheduler ................................... SUCCESS [ 9.994 s]
[INFO] dolphinscheduler-ui ................................ SUCCESS [ 1.827 s]
[INFO] dolphinscheduler-common ............................ SUCCESS [ 30.829 s]
[INFO] dolphinscheduler-dao ............................... SUCCESS [01:47 min]
[INFO] dolphinscheduler-rpc ............................... SUCCESS [09:46 min]
[INFO] dolphinscheduler-alert ............................. SUCCESS [01:29 min]
[INFO] dolphinscheduler-server ............................ SUCCESS [ 19.841 s]
[INFO] dolphinscheduler-api ............................... SUCCESS [06:49 min]
[INFO] dolphinscheduler-dist .............................. FAILURE [ 51.450 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 21:52 min
[INFO] Finished at: 2020-02-27T11:43:35+08:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:rpm-maven-plugin:2.2.0:attached-rpm (default) on project dolphinscheduler-dist: Source location /opt/apache-dolphinscheduler-incubating-1.2.1-src-release/dolphinscheduler-dist/../dolphinscheduler-ui/dist does not exist -> [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/MojoExecutionException
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR] mvn -rf :dolphinscheduler-dist