FailedConsole Output

maven31-agent.jar already up to date
maven31-interceptor.jar already up to date
maven3-interceptor-commons.jar already up to date
<===[JENKINS REMOTING CAPACITY]===>channel started
Executing Maven:  -B -f /var/lib/jenkins/workspace/taverna-xpath-activity-maintenance/pom.xml -Dmaven.repo.local=/var/lib/jenkins/workspace/taverna-xpath-activity-maintenance/.repository clean install
[INFO] Scanning for projects...
[INFO] Initializing Artifactory Build-Info Recording
[HUDSON] Collecting dependencies info
[INFO] 
[INFO] Using the builder org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder with a thread count of 1
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building Taverna XPath Activity 1.6-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] Downloading: http://repository.mygrid.org.uk/artifactory/repo/net/sf/taverna/t2/ui-api/report-api/1.6-SNAPSHOT/maven-metadata.xml
[WARNING] Could not transfer metadata net.sf.taverna.t2.ui-api:report-api:1.6-SNAPSHOT/maven-metadata.xml from/to mygrid-snapshot-repository (http://repository.mygrid.org.uk/artifactory/repo): Failed to transfer file: http://repository.mygrid.org.uk/artifactory/repo/net/sf/taverna/t2/ui-api/report-api/1.6-SNAPSHOT/maven-metadata.xml. Return code is: 503 , ReasonPhrase:Service Temporarily Unavailable.
[WARNING] Failure to transfer net.sf.taverna.t2.ui-api:report-api:1.6-SNAPSHOT/maven-metadata.xml from http://repository.mygrid.org.uk/artifactory/repo was cached in the local repository, resolution will not be reattempted until the update interval of mygrid-snapshot-repository has elapsed or updates are forced. Original error: Could not transfer metadata net.sf.taverna.t2.ui-api:report-api:1.6-SNAPSHOT/maven-metadata.xml from/to mygrid-snapshot-repository (http://repository.mygrid.org.uk/artifactory/repo): Failed to transfer file: http://repository.mygrid.org.uk/artifactory/repo/net/sf/taverna/t2/ui-api/report-api/1.6-SNAPSHOT/maven-metadata.xml. Return code is: 503 , ReasonPhrase:Service Temporarily Unavailable.
[INFO] Downloading: http://repository.mygrid.org.uk/artifactory/repo/net/sf/taverna/t2/ui-api/1.6-SNAPSHOT/maven-metadata.xml
[WARNING] Could not transfer metadata net.sf.taverna.t2:ui-api:1.6-SNAPSHOT/maven-metadata.xml from/to mygrid-snapshot-repository (http://repository.mygrid.org.uk/artifactory/repo): Failed to transfer file: http://repository.mygrid.org.uk/artifactory/repo/net/sf/taverna/t2/ui-api/1.6-SNAPSHOT/maven-metadata.xml. Return code is: 503 , ReasonPhrase:Service Temporarily Unavailable.
[INFO] Downloading: http://repository.mygrid.org.uk/artifactory/repo/net/sf/taverna/t2/ui-api/1.6-SNAPSHOT/ui-api-1.6-20140528.132526-7.pom
[INFO] Downloading: http://repository.mygrid.org.uk/artifactory/repo/net/sf/taverna/t2/ui-components/report-view/1.6-SNAPSHOT/maven-metadata.xml
[WARNING] Could not transfer metadata net.sf.taverna.t2.ui-components:report-view:1.6-SNAPSHOT/maven-metadata.xml from/to mygrid-snapshot-repository (http://repository.mygrid.org.uk/artifactory/repo): Failed to transfer file: http://repository.mygrid.org.uk/artifactory/repo/net/sf/taverna/t2/ui-components/report-view/1.6-SNAPSHOT/maven-metadata.xml. Return code is: 503 , ReasonPhrase:Service Temporarily Unavailable.
[WARNING] Failure to transfer net.sf.taverna.t2.ui-components:report-view:1.6-SNAPSHOT/maven-metadata.xml from http://repository.mygrid.org.uk/artifactory/repo was cached in the local repository, resolution will not be reattempted until the update interval of mygrid-snapshot-repository has elapsed or updates are forced. Original error: Could not transfer metadata net.sf.taverna.t2.ui-components:report-view:1.6-SNAPSHOT/maven-metadata.xml from/to mygrid-snapshot-repository (http://repository.mygrid.org.uk/artifactory/repo): Failed to transfer file: http://repository.mygrid.org.uk/artifactory/repo/net/sf/taverna/t2/ui-components/report-view/1.6-SNAPSHOT/maven-metadata.xml. Return code is: 503 , ReasonPhrase:Service Temporarily Unavailable.
[INFO] Downloading: http://repository.mygrid.org.uk/artifactory/repo/net/sf/taverna/t2/ui-components/1.6-SNAPSHOT/maven-metadata.xml
[WARNING] Could not transfer metadata net.sf.taverna.t2:ui-components:1.6-SNAPSHOT/maven-metadata.xml from/to mygrid-snapshot-repository (http://repository.mygrid.org.uk/artifactory/repo): Failed to transfer file: http://repository.mygrid.org.uk/artifactory/repo/net/sf/taverna/t2/ui-components/1.6-SNAPSHOT/maven-metadata.xml. Return code is: 503 , ReasonPhrase:Service Temporarily Unavailable.
[INFO] Downloading: http://repository.mygrid.org.uk/artifactory/repo/net/sf/taverna/t2/ui-components/1.6-SNAPSHOT/ui-components-1.6-20140528.135421-8.pom
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4.751 s
[INFO] Finished at: 2014-05-30T14:38:18+00:00
[INFO] Final Memory: 11M/79M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project xpath-activity: Could not resolve dependencies for project net.sf.taverna.t2.activities:xpath-activity:jar:1.6-SNAPSHOT: Failed to collect dependencies at net.sf.taverna.t2.ui-api:report-api:jar:1.6-SNAPSHOT: Failed to read artifact descriptor for net.sf.taverna.t2.ui-api:report-api:jar:1.6-SNAPSHOT: Could not transfer artifact net.sf.taverna.t2:ui-api:pom:1.6-20140528.132526-7 from/to mygrid-snapshot-repository (http://repository.mygrid.org.uk/artifactory/repo): Failed to transfer file: http://repository.mygrid.org.uk/artifactory/repo/net/sf/taverna/t2/ui-api/1.6-SNAPSHOT/ui-api-1.6-20140528.132526-7.pom. Return code is: 503, ReasonPhrase: Service Temporarily Unavailable. -> [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