Can't build LightAdmin SandBox

[yjdwbj]

[INFO] Building LightAdmin SandBox 1.2.0.BUILD-SNAPSHOT
[INFO] ------------------------------------------------------------------------
Downloading: http://lightadmin.org/nexus/content/repositories/snapshots/org/lightadmin/lightadmin/1.2.0.BUILD-SNAPSHOT/maven-metadata.xml
Downloading: http://lightadmin.org/nexus/content/repositories/releases/org/lightadmin/lightadmin/1.2.0.BUILD-SNAPSHOT/maven-metadata.xml
[WARNING] Could not transfer metadata org.lightadmin:lightadmin:1.2.0.BUILD-SNAPSHOT/maven-metadata.xml from/to lightadmin-nexus-snapshots (http://lightadmin.org/nexus/content/repositories/snapshots): lightadmin.org: Temporary failure in name resolution
[WARNING] Could not transfer metadata org.lightadmin:lightadmin:1.2.0.BUILD-SNAPSHOT/maven-metadata.xml from/to lightadmin-nexus-releases (http://lightadmin.org/nexus/content/repositories/releases): lightadmin.org
Downloading: http://lightadmin.org/nexus/content/repositories/releases/org/lightadmin/light-logging-configurer/1.0.0.BUILD-SNAPSHOT/maven-metadata.xml
Downloading: http://lightadmin.org/nexus/content/repositories/snapshots/org/lightadmin/light-logging-configurer/1.0.0.BUILD-SNAPSHOT/maven-metadata.xml
[WARNING] Could not transfer metadata org.lightadmin:light-logging-configurer:1.0.0.BUILD-SNAPSHOT/maven-metadata.xml from/to lightadmin-nexus-snapshots (http://lightadmin.org/nexus/content/repositories/snapshots): lightadmin.org
[WARNING] Could not transfer metadata org.lightadmin:light-logging-configurer:1.0.0.BUILD-SNAPSHOT/maven-metadata.xml from/to lightadmin-nexus-releases (http://lightadmin.org/nexus/content/repositories/releases): lightadmin.org
[WARNING] Failure to transfer org.lightadmin:light-logging-configurer:1.0.0.BUILD-SNAPSHOT/maven-metadata.xml from http://lightadmin.org/nexus/content/repositories/snapshots was cached in the local repository, resolution will not be reattempted until the update interval of lightadmin-nexus-snapshots has elapsed or updates are forced. Original error: Could not transfer metadata org.lightadmin:light-logging-configurer:1.0.0.BUILD-SNAPSHOT/maven-metadata.xml from/to lightadmin-nexus-snapshots (http://lightadmin.org/nexus/content/repositories/snapshots): lightadmin.org
[WARNING] Failure to transfer org.lightadmin:light-logging-configurer:1.0.0.BUILD-SNAPSHOT/maven-metadata.xml from http://lightadmin.org/nexus/content/repositories/releases was cached in the local repository, resolution will not be reattempted until the update interval of lightadmin-nexus-releases has elapsed or updates are forced. Original error: Could not transfer metadata org.lightadmin:light-logging-configurer:1.0.0.BUILD-SNAPSHOT/maven-metadata.xml from/to lightadmin-nexus-releases (http://lightadmin.org/nexus/content/repositories/releases): lightadmin.org
Downloading: http://lightadmin.org/nexus/content/repositories/snapshots/org/lightadmin/light-logging-configurer/1.0.0.BUILD-SNAPSHOT/light-logging-configurer-1.0.0.BUILD-SNAPSHOT.pom
Downloading: http://lightadmin.org/nexus/content/repositories/releases/org/lightadmin/light-logging-configurer/1.0.0.BUILD-SNAPSHOT/light-logging-configurer-1.0.0.BUILD-SNAPSHOT.pom
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] LightAdmin ......................................... SUCCESS [ 0.582 s]
[INFO] LightAdmin Dev Kit ................................. SUCCESS [ 0.003 s]
[INFO] LightAdmin SandBox ................................. FAILURE [ 20.424 s]
[INFO] LightAdmin Selenium ................................ SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 21.299 s
[INFO] Finished at: 2017-11-01T10:51:09+08:00
[INFO] Final Memory: 24M/383M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project lightadmin-sandbox: Could not resolve dependencies for project org.lightadmin:lightadmin-sandbox:war:1.2.0.BUILD-SNAPSHOT: Failed to collect dependencies at org.lightadmin:light-logging-configurer:jar:1.0.0.BUILD-SNAPSHOT: Failed to read artifact descriptor for org.lightadmin:light-logging-configurer:jar:1.0.0.BUILD-SNAPSHOT: Could not transfer artifact org.lightadmin:light-logging-configurer:pom:1.0.0.BUILD-SNAPSHOT from/to lightadmin-nexus-snapshots (http://lightadmin.org/nexus/content/repositories/snapshots): lightadmin.org: Unknown host lightadmin.org -> [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
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR] mvn -rf :lightadmin-sandbox

[alberthuihk]

Their nexus repo is down.

[rayaPajohesh]

What should we do? how alert them to repair nexus?