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java.lang.NullPointerException: 	at org.pentaho.openformula.ui.DefaultFunctionParameterEditor.setSelectedFunction(DefaultFunctionParameterEditor.java:253)	at org.pentaho.openformula.ui.MultiplexFunctionParameterEditor.setSelectedFunction(MultiplexFunctionParameterEditor.java:122)	at org.pentaho.openformula.ui.FormulaEditorDialog.revalidateParameters(FormulaEditorDialog.java:692)	at org.pentaho.openformula.ui.FormulaEditorDialog$CaretHandler.caretUpdate(FormulaEditorDialog.java:96)	at javax.swing.text.JTextComponent.fireCaretUpdate(JTextComponent.java:391)