SimplePanel can only contain one child widget

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When i run the following Code and push Button "Push", more than once a time, i get browser error "simplePanel can only contain one child widget". How can i solve that problem? thank you in advance! Jogi public class Projekt implements EntryPoint { private RootPanel rootPanel; public void onModuleLoad() { rootPanel = RootPanel.get("gwtContainer"); rootPanel.setSize("1902", "868"); final AbsolutePanel boundaryPanel = new AbsolutePanel(); boundaryPanel.setStyleName("frame1"); boundaryPanel.setSize("1455px", "600px"); final Diagram diagram = new Diagram(boundaryPanel); RootPanel.get().add(boundaryPanel, 446, 242); final Connector con = new Connector(100, 300, 300, 500); Button la = new Button("Push"); la.setSize("200", "200"); RootPanel.get().add(la); Button la2 = new Button("Push2"); la2.setSize("200", "200"); RootPanel.get().add(la2); final Image img = new Image("images/concrete.svg"); img.setSize("200", "200"); final Shape shapei = new Shape(img); Image img2 = new Image("images/variable.svg"); img2.setSize("200", "200"); boundaryPanel.add(img2, 200,200); final Shape shapei2 = new Shape(img2); shapei2.showOnDiagram(diagram); la.addClickHandler(new ClickHandler(){ @Override public void onClick(ClickEvent event) { boundaryPanel.add(img, 100,100); shapei.showOnDiagram(diagram); } }); la2.addClickHandler(new ClickHandler(){ @Override public void onClick(ClickEvent event) { con.showOnDiagram(diagram); } }); diagram.addDiagramListener(new DiagramListenerAdapter() { @Override public void onElementConnect(ElementConnectEvent event) { if (con.startEndPoint.isGluedToConnectionPoint()) { Widget connected = con.startEndPoint.gluedConnectionPoint.parentWidget; if(connected.equals(shapei.connectedWidget)){ Image logo = new Image("images/xor.svg"); logo.setSize("100", "100"); boundaryPanel.add(logo); } else if(connected.equals(shapei2.connectedWidget)){ Image logo2 = new Image("images/and.svg"); logo2.setSize("100", "100"); boundaryPanel.add(logo2); }; }} }); }}

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