When packaging the IPA file, I get a NullPointerException.

Cleaning up previously generated .ipa files
Cleaning up previously generated .dSYM.zip files
Packaging IPA
FATAL: null
java.lang.NullPointerException
at au.com.rayh.XCodeBuilder.perform(XCodeBuilder.java:575)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:804)
at hudson.model.Build$BuildExecution.build(Build.java:199)
at hudson.model.Build$BuildExecution.doRun(Build.java:160)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:586)
at hudson.model.Run.execute(Run.java:1597)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:247)

All was fine in version 1.3.3 of the Xcode plugin.