internal Error by using horizontalSplitPanel

Vaadin 6 / 7 / 8 Framework UI
1

Hello,

when using
horizontalSplitPanel.setSplitPosition(750, Sizeable.UNITS_PIXELS);
 generates the applications a
internal Error
.


        horizontalSplitPanel = new HorizontalSplitPanel();
        [b]
horizontalSplitPanel.setSplitPosition(750, Sizeable.UNITS_PIXELS);
[/b]
        horizontalSplitPanel.setLocked(false);
        horizontalSplitPanel.setHeight("450px");
        horizontalSplitPanel.setWidth("100%");
        addComponent(horizontalSplitPanel);

If I remove the line, the error no longer occurs.
Maybe someone has a tip, why this might be?

Thanks in advance

2

The problem has done himself.
Under Netbeans it is problem with the version of Vaadin, when both are in the lib folder.
Removing the old version, dissolves the problem.