In some cases, a job fails to run on a slave started via the vsphere-cloud plugin. The build log reports the following:
10:01:13 FATAL: null
10:01:13 java.lang.NullPointerException
10:01:13 at org.jenkinsci.plugins.vSphereCloudSlave.StartLimitedTestRun(vSphereCloudSlave.java:122)
10:01:13 at org.jenkinsci.plugins.vSphereCloudRunListener.onStarted(vSphereCloudRunListener.java:36)
10:01:13 at hudson.model.listeners.RunListener.fireStarted(RunListener.java:188)
10:01:13 at hudson.model.Run.run(Run.java:1429)
10:01:13 at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
10:01:13 at hudson.model.ResourceController.execute(ResourceController.java:88)
10:01:13 at hudson.model.Executor.run(Executor.java:239)