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JavaScriptException (TypeError) in Canvas::addChild

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Hello,

I upgraded to SNAPSHOT_v9.1d_2014-02-04/Pro Deployment 2014-02-04.
Now I am getting an exception:
Code:

Caused by: com.google.gwt.core.client.JavaScriptException: (TypeError) @com.smartgwt.client.widgets.Canvas::addChild(Lcom/smartgwt/client/widgets/Canvas;)([Java object: de.hicms.explanner.client.app.ui.views.allocation.AllocatorView@54067821]): _29 is undefined
    at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:249)
    at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:571)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:279)
    at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
    at com.smartgwt.client.widgets.Canvas.addChild(Canvas.java)


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