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java.lang.NullPointerException: 	at java.lang.String$CaseInsensitiveComparator.compare(Unknown Source)	at java.lang.String$CaseInsensitiveComparator.compare(Unknown Source)	at java.util.TimSort.countRunAndMakeAscending(Unknown Source)	at java.util.TimSort.sort(Unknown Source)	at java.util.Arrays.sort(Unknown Source)	at org.pentaho.di.ui.spoon.Spoon.refreshSlavesSubtree(Spoon.java:6456)	at org.pentaho.di.ui.spoon.Spoon.refreshTree(Spoon.java:6197)	at org.pentaho.di.ui.spoon.delegates.SpoonTabsDelegate.tabSelected(SpoonTabsDelegate.java:450)	at org.pentaho.di.ui.spoon.Spoon.tabSelected(Spoon.java:3274)	at org.pentaho.xul.swt.tab.TabSet.notifySelectListeners(TabSet.java:101)	at org.pentaho.xul.swt.tab.TabSet.setSelected(TabSet.java:198)	at org.pentaho.di.ui.spoon.delegates.SpoonTransformationDelegate.addTransGraph(SpoonTransformationDelegate.java:213)	at org.pentaho.di.ui.spoon.Spoon.addTransGraph(Spoon.java:8688)	at org.pentaho.di.ui.spoon.TransFileListener.open(TransFileListener.java:82)	at org.pentaho.di.ui.spoon.Spoon.openFile(Spoon.java:4550)	at org.pentaho.di.ui.spoon.Spoon.loadLastUsedFile(Spoon.java:8108)	at org.pentaho.di.ui.spoon.Spoon.loadLastUsedFiles(Spoon.java:7871)	at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:7895)	at org.pentaho.di.ui.spoon.Spoon.createContents(Spoon.java:9174)	at org.eclipse.jface.window.Window.create(Window.java:426)	at org.eclipse.jface.window.Window.open(Window.java:785)	at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:9189)	at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:654)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.pentaho.commons.launcher.Launcher.main(Launcher.java:92)