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java.lang.NullPointerException: 	at org.apache.ivy.core.sort.CollectionOfModulesToSort.addToModulesByModuleId(CollectionOfModulesToSort.java:71)	at org.apache.ivy.core.sort.CollectionOfModulesToSort.(CollectionOfModulesToSort.java:66)	at org.apache.ivy.core.sort.ModuleDescriptorSorter.(ModuleDescriptorSorter.java:51)	at org.apache.ivy.core.sort.SortEngine.sortModuleDescriptors(SortEngine.java:99)	at org.apache.ivy.Ivy.sortModuleDescriptors(Ivy.java:639)	at hudson.ivy.IvyModuleSetBuild$IvyXmlParser.call(IvyModuleSetBuild.java:798)	at hudson.ivy.IvyModuleSetBuild$IvyXmlParser.call(IvyModuleSetBuild.java:744)	at hudson.remoting.UserRequest.perform(UserRequest.java:114)	at hudson.remoting.UserRequest.perform(UserRequest.java:48)	at hudson.remoting.Request$2.run(Request.java:270)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)	at java.util.concurrent.FutureTask.run(FutureTask.java:138)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)	at java.lang.Thread.run(Thread.java:619)