show [ERROR] Element may only contain a single child element in gwt 2.4.

[David Fernando]

I got error when I compile the project. Please give your suggestion.

<g:DockLayoutPanel ui:field="dock">
                <g:north size="25">
                     <g:FlowPanel>
                           <g:Button ui:field="save">Login</ g:Button>
                     </g:FlowPanel>
                </g:north>
                <g:center>
                   <g:VerticalPanelui:field="panel1">
                               <g:Button ui:field="button1">sample1</
g:Button>
                                <g:Button ui:field="button2">sample2</
g:Button>
                   </g:VerticalPanel>
                  <g:VerticalPanel ui:field="panel2">
                                <g:TextArea ui:field="textArea" />
                  /g:VerticalPanel>
                </g:center>
        </g:DockLayoutPanel>
</ui:UiBinder>

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