I'm using 1.375 with the latest version of the Perforce plugin. From the logs, I'm not sure what might be misconfigured, but I'm getting it consistently. Just hoping the error might provide clues as to the problem.

At the end of the build, the label (disk) icon appears next to the build list with the correct value, the build fails on this error. I've tried other simpler labels ${JOB_NAME}, etc. besides the one shown.

Labelling Build in Perforce using ${JOB_NAME}-b${BUILD_NUMBER}
ERROR: Publisher hudson.plugins.perforce.PerforceTagNotifier aborted due to exception
java.lang.NullPointerException
at hudson.plugins.perforce.PerforceSCM.parseProjectPath(PerforceSCM.java:1340)
at hudson.plugins.perforce.PerforceTagAction.tagBuild(PerforceTagAction.java:146)
at hudson.plugins.perforce.PerforceTagNotifier.perform(PerforceTagNotifier.java:76)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:601)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:580)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:558)
at hudson.model.Build$RunnerImpl.post2(Build.java:158)
at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:528)
at hudson.model.Run.run(Run.java:1296)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:129)