why I often get (in red) the following message in Matlab

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why I often get (in red) the following message in the Command Window ?

    [ConditionalEventPump] Exception occurred during event dispatching: 
    java.lang.IllegalStateException: cannot open system clipboard at 
    sun.awt.windows.WClipboard.openClipboard(Native Method) at 
    sun.awt.datatransfer.SunClipboard.getClipboardFormatsOpenClose(Unknown Source) at 
    sun.awt.datatransfer.SunClipboard.isDataFlavorAvailable(Unknown Source) at 
    com.mathworks.widgets.grouptable.transfer.Transfer.isDataFlavorAvailable(Transfer.java:58) at 
    com.mathworks.mlwidgets.explorer.FileTransferHandler.accept(FileTransferHandler.java:84) at 
    com.mathworks.mlwidgets.explorer.FileTransferHandler.accept(FileTransferHandler.java:35) at 
    com.mathworks.widgets.grouptable.transfer.TransferController.canPaste(TransferController.java:91) at 
    com.mathworks.widgets.grouptable.GroupingTable.canPaste(GroupingTable.java:603) at 
    com.mathworks.mlwidgets.explorer.actions.ActionPredicates$9.accept(ActionPredicates.java:30) at 
    com.mathworks.mlwidgets.explorer.actions.ActionPredicates$9.accept(ActionPredicates.java:30) at 
    com.mathworks.mlwidgets.explorer.actions.ActionProperties.isEnabled(ActionProperties.java:48) at 
    com.mathworks.mlwidgets.explorer.actions.DocumentActions.getInstance(DocumentActions.java:678) at 
    com.mathworks.mde.explorer.ExplorerActionManager$4.contribute(ExplorerActionManager.java:127) at 
    com.mathworks.mde.explorer.ExplorerActionManager$3.run(ExplorerActionManager.java:93) at 
    com.mathworks.mwswing.MJUtilities.runOnEventDispatchThread(MJUtilities.java:823) at 
    com.mathworks.mde.explorer.ExplorerActionManager.refreshActions(ExplorerActionManager.java:89) at 
    com.mathworks.mde.explorer.ExplorerActionManager.access$000(ExplorerActionManager.java:37) at 
    com.mathworks.mde.explorer.ExplorerActionManager$2.valueChanged(ExplorerActionManager.java:75) at 
    com.mathworks.widgets.grouptable.GroupingTable$2.valueChanged(GroupingTable.java:144) at 
    javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source) at 
    javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source) at 
    javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source) at 
    javax.swing.DefaultListSelectionModel.setLeadSelectionIndex(Unknown Source) at 
    com.jidesoft.grid.JideTable.b(Unknown Source) at 
    com.jidesoft.grid.JideTable.tableChanged(Unknown Source) at 
    com.jidesoft.grid.CellSpanTable.tableChanged(Unknown Source) at 
    javax.swing.table.AbstractTableModel.fireTableChanged(Unknown Source) at 
    javax.swing.table.AbstractTableModel.fireTableDataChanged(Unknown Source) at 
    com.jidesoft.grid.TreeTableModel.refresh(Unknown Source) at 
    com.mathworks.widgets.grouptable.GroupingTableModel.generateGroups(GroupingTableModel.java:959) at 
    com.mathworks.widgets.grouptable.GroupingTableModel.access$900(GroupingTableModel.java:34) at 
    com.mathworks.widgets.grouptable.GroupingTableModel$18.run(GroupingTableModel.java:847) at 
    com.mathworks.widgets.grouptable.GroupingTableModel$20.run(GroupingTableModel.java:929) 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)