What version did you upgrade from? Looking at the change log, there was a change relating to matrix projects in 1.472, but not 1.473.
From: jenkinsci-users@googlegroups.com [mailto:jenkinsci-users@googlegroups.com] On Behalf Of Thomas Fields Sent: 02 July 2012 11:39 To: jenkinsci-users@googlegroups.com Subject: Re: Upgrading to v1.473 has broken all my matrix jobs I just spotted https://issues.jenkins-ci.org/browse/JENKINS-14273. Please fix asap. On Monday, 2 July 2012 11:37:30 UTC+1, Thomas Fields wrote: Hi there, I just upgraded to Jenkins 1.473 and I'm getting this for all my matrix jobs: SEVERE: Failed Loading job PhyreAssetPacker-Live java.lang.NullPointerException at hudson.matrix.MatrixProject.updateTransientActions(MatrixProject.java:431) at hudson.model.AbstractProject.onLoad(AbstractProject.java:296) at hudson.matrix.MatrixProject.onLoad(MatrixProject.java:466) at hudson.model.Items.load(Items.java:115) at jenkins.model.Jenkins$17.run(Jenkins.java:2492) at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:146) at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:259) at jenkins.model.Jenkins$7.runTask(Jenkins.java:878) at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:187) at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:94) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Anyone know what the problem might be? Cheers, Tom.