AttachDetachException when integrating gwt uploader in application

[Nick K 79]

Hi @all,

I try to introduce gwt uploader into my application (GWT 2.6.1, GXT 3.1) according to the quickstart and code samples, but when I try to call the dialog with the upload-widget, I got following exception:

com.google.gwt.user.client.ui.AttachDetachException: Exception caught: Exception caught: Exception caught: Exception caught: Exception caught: (TypeError) @org.moxieapps.gwt.uploader.client.Uploader::nativeCreateSWFUpload(Lcom/google/gwt/core/client/JavaScriptObject;Lcom/google/gwt/core/client/JavaScriptObject;)([JavaScript object(19895), JavaScript object(20247)]): Das Objekt unterstützt diese Aktion nicht.
at com.google.gwt.user.client.ui.AttachDetachException.tryCommand(AttachDetachException.java:87)
at com.sencha.gxt.widget.core.client.container.Container.doAttachChildren(Container.java:312)
at com.sencha.gxt.widget.core.client.ContentPanel.doAttachChildren(ContentPanel.java:583)
at com.google.gwt.user.client.ui.Widget.onAttach(Widget.java:354)
at com.sencha.gxt.widget.core.client.Component.onAttach(Component.java:1283)
at com.google.gwt.user.client.ui.Widget.setParent(Widget.java:484)
at com.google.gwt.user.client.ui.Panel.adopt(Panel.java:124)
at com.google.gwt.user.client.ui.ComplexPanel.add(ComplexPanel.java:105)
at com.google.gwt.user.client.ui.AbsolutePanel.add(AbsolutePanel.java:97)
at com.sencha.gxt.widget.core.client.Window.show(Window.java:944)
(...)

Currently, I'm running the application in GWT development mode in IE...

Any hints, what I may be doing wrong?
Thanks in advance,
Nick

[Shawn Quinn]

I haven't run across this, but we tend to use Super Dev Mode for the bulk of our GWT development here instead of regular Dev Mode. Do you run into this same error if you just run a full GWT compile; or does this only occur in dev mode?