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java.lang.NullPointerException: 	at com.ibm.wps.config.install.OfferingTree.(OfferingTree.java:263)	at com.ibm.wps.config.install.InstallEngine.getOfferingTreeFromExistingInstall(InstallEngine.java:112)	at com.ibm.wps.config.install.InstallEngine.main(InstallEngine.java:1178)	at com.ibm.wps.config.tasks.InstallEngineTask.execute(InstallEngineTask.java:25)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)	at org.apache.tools.ant.Task.perform(Task.java:364)	at com.ibm.wps.config.TryCatchTask.execute(TryCatchTask.java:106)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)	at org.apache.tools.ant.Task.perform(Task.java:364)	at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:64)	at com.ibm.wps.config.If.execute(If.java:75)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)	at org.apache.tools.ant.Task.perform(Task.java:364)	at org.apache.tools.ant.Target.execute(Target.java:341)	at org.apache.tools.ant.Target.performTasks(Target.java:369)	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)	at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:37)	at org.apache.tools.ant.Project.executeTargets(Project.java:1068)	at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:382)	at org.apache.tools.ant.taskdefs.CallTarget.execute(CallTarget.java:107)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)	at org.apache.tools.ant.Task.perform(Task.java:364)	at com.ibm.wps.config.TryCatchTask.execute(TryCatchTask.java:106)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)	at org.apache.tools.ant.Task.perform(Task.java:364)	at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:64)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)	at org.apache.tools.ant.Task.perform(Task.java:364)	at com.ibm.wps.config.ForTask.execute(ForTask.java:56)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)	at org.apache.tools.ant.Task.perform(Task.java:364)	at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:64)	at com.ibm.wps.config.If.execute(If.java:75)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)	at org.apache.tools.ant.Task.perform(Task.java:364)	at org.apache.tools.ant.Target.execute(Target.java:341)	at org.apache.tools.ant.Target.performTasks(Target.java:369)	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)	at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:37)	at org.apache.tools.ant.Project.executeTargets(Project.java:1068)	at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:382)	at org.apache.tools.ant.taskdefs.CallTarget.execute(CallTarget.java:107)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)	at org.apache.tools.ant.Task.perform(Task.java:364)	at com.ibm.wps.config.TryCatchTask.execute(TryCatchTask.java:106)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)	at org.apache.tools.ant.Task.perform(Task.java:364)	at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:64)	at com.ibm.wps.config.If.execute(If.java:75)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)	at org.apache.tools.ant.Task.perform(Task.java:364)	at org.apache.tools.ant.Target.execute(Target.java:341)	at org.apache.tools.ant.Target.performTasks(Target.java:369)	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)	at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:37)	at org.apache.tools.ant.Project.executeTargets(Project.java:1068)	at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:382)	at org.apache.tools.ant.taskdefs.CallTarget.execute(CallTarget.java:107)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)	at org.apache.tools.ant.Task.perform(Task.java:364)	at com.ibm.wps.config.TryCatchTask.execute(TryCatchTask.java:106)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)	at org.apache.tools.ant.Task.perform(Task.java:364)	at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:64)	at com.ibm.wps.config.If.execute(If.java:75)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)	at org.apache.tools.ant.Task.perform(Task.java:364)	at org.apache.tools.ant.Target.execute(Target.java:341)	at org.apache.tools.ant.Target.performTasks(Target.java:369)	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)	at org.apache.tools.ant.Project.executeTarget(Project.java:1185)	at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40)	at org.apache.tools.ant.Project.executeTargets(Project.java:1068)	at org.apache.tools.ant.Main.runBuild(Main.java:668)	at org.apache.tools.ant.Main.startAnt(Main.java:187)	at org.apache.tools.ant.Main.start(Main.java:150)	at com.ibm.wps.config.ConfigEngine.process(ConfigEngine.java:819)	at com.ibm.wps.config.ConfigEngine.main(ConfigEngine.java:247)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)	at java.lang.reflect.Method.invoke(Method.java:611)	at com.ibm.ws.bootstrap.WSLauncher.main(WSLauncher.java:267)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)	at java.lang.reflect.Method.invoke(Method.java:611)	at com.ibm.wps.config.launch.ConfigEngineLauncher.process(ConfigEngineLauncher.java:269)	at com.ibm.wps.config.launch.ConfigEngineLauncher.main(ConfigEngineLauncher.java:311)