error message Exception in Exception in thread "AWT-EventQueue-0"

Hi All,
I encountered this error running a script that has worked without problem. Any idea what's wrong?
Exception in Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at java.util.Arrays$ArrayList.<init>(Unknown Source)
at java.util.Arrays.asList(Unknown Source)
at com.mathworks.mlwidgets.importtool.AbstractFileTableModel.getDefaultColumnVarNames(AbstractFileTableModel.java:106)
at com.mathworks.mlwidgets.importtool.TextFileTableModel.getDefaultColumnVarNames(TextFileTableModel.java:19)
at com.mathworks.mlwidgets.importtool.ImportTable.getColumnVariableNamesArray(ImportTable.java:277)
at com.mathworks.mlwidgets.importtool.TextTable.tableChanged(TextTable.java:1277)
at javax.swing.table.AbstractTableModel.fireTableChanged(Unknown Source)
at javax.swing.table.AbstractTableModel.fireTableStructureChanged(Unknown Source)
at com.mathworks.mlwidgets.importtool.TextFileTableModel.matlabCallback(TextFileTableModel.java:632)
at com.mathworks.mlwidgets.importtool.TextFileTableModel$7$2.run(TextFileTableModel.java:564)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source
- Katherine

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