java.lang.NullPointerException: This exception has no message.

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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 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 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 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 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 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 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 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 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 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 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)

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