java.util.ConcurrentModificationException
        at java.util.HashMap$HashIterator.nextEntry(HashMap.java:922)
        at java.util.HashMap$KeyIterator.next(HashMap.java:956)
        at com.google.common.collect.AbstractMapBasedMultimap$WrappedCollection$WrappedIterator.next(AbstractMapBasedMultimap.java:484)
        at com.google.common.collect.Iterators$7.computeNext(Iterators.java:701)
        at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
        at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
        at com.google.common.collect.Sets.removeAllImpl(Sets.java:1598)
        at com.google.common.collect.Sets.removeAllImpl(Sets.java:1627)
        at com.google.common.collect.AbstractMapBasedMultimap$WrappedSet.removeAll(AbstractMapBasedMultimap.java:614)
        at javaposse.jobdsl.plugin.ExecuteDslScripts.updateTemplates(ExecuteDslScripts.java:226)
        at javaposse.jobdsl.plugin.ExecuteDslScripts.perform(ExecuteDslScripts.java:183)
        at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
        at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:772)
        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:535)
        at hudson.model.Run.execute(Run.java:1732)
        at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
        at hudson.model.ResourceController.execute(ResourceController.java:88)
        at hudson.model.Executor.run(Executor.java:234)