It works for me too. It fails on my clients' computers from time to
time. If I could make a reproduce scenario I would submit a bug.
I write here because I can't find a way to reproduce this error.

On Jul 16, 4:04 pm, Jaroslav Záruba <[email protected]> wrote:
> I threw away the Formatter and ObjectControl references so that I could
> compile it, and it works in Chrome and FF too.
>
>
>
> On Fri, Jul 16, 2010 at 2:49 PM, evgenyk <[email protected]> wrote:
> > Just received an exception inside the following block:
> > ----------------
> > function $Label(this$static, text){
> >   $setElement(this$static, ($clinit_73() ,
> > $doc).createElement('div'));
> >  (!!this$static.element || throwAssertionError_Object("This
> > UIObject's element is not set; you may be missing a call to either
> > Composite.initWidget() or UIObject.setElement()") , this
> > $static.element)['className'] = 'gwt-Label';
> >   this$static.setText(text);
> >  return this$static;
> > }
> > ----------------
> > exception was thrown in 3rd line: (!!this$static.element ||....
> > This is plain GWT Label. It seems like a bug in GWT with Firefox
> > 3.0.10
> > Unfortunately I can't reproduce it. Time after time it is thrown on my
> > client workstations. It is caught using
> > GWT.setUncaughtExceptionHandler.
> > Any ideas?
>
> > On Jul 16, 3:23 pm, evgenyk <[email protected]> wrote:
> > > public class MyLabel<T> extends Label implements ObjectControl<T> {
> > >     public T object;
> > >     private boolean objectText = false;
> > >     private Formatter<T> formatter = new DefaultFormatter();
>
> > >     public MyLabel() {
> > >     }
>
> > >     public MyLabel(String text) {
> > >         super(text);
> > >     }
>
> > >     public MyLabel(String id, String text) {
> > >         super(text);
> > >         id(id);
> > >     }
>
> > >     public MyLabel(String id, String style, String text) {
> > >         this(id, text);
> > >         setStyleName(style);
> > >     }
>
> > >     public MyLabel(Element element) {
> > >         super(element);
> > >     }
>
> > >     public MyLabel<T> style(String style) {
> > >         setStyleName(style);
> > >         return this;
> > >     }
>
> > >     public MyLabel<T> addStyle(String style, boolean condition) {
> > >         if (condition) {
> > >             addStyle(style);
> > >         } else {
> > >             removeStyleName(style);
> > >         }
> > >         return this;
> > >     }
>
> > >     public MyLabel<T> addStyle(String style) {
> > >         addStyleName(style);
> > >         return this;
> > >     }
>
> > >     public MyLabel<T> id(String id) {
> > >         IDUtil.id(this, id);
> > >         return this;
> > >     }
>
> > >     public MyLabel<T> text(String text) {
> > >         setText(text);
> > >         return this;
> > >     }
>
> > >     public MyLabel<T> html(String html) {
> > >         DOM.setInnerHTML(getElement(), html);
> > >         return this;
> > >     }
>
> > >     public MyLabel<T> visible(boolean visible) {
> > >         setVisible(visible);
> > >         return this;
> > >     }
>
> > >     public String text() {
> > >         return getElement().getInnerText();
> > >     }
>
> > >     public MyLabel<T> width(String value) {
> > >         setWidth(value);
> > >         return this;
> > >     }
>
> > >     public String getText() {
> > >         return text();
> > >     }
>
> > >     public String html() {
> > >         return getElement().getInnerHTML();
> > >     }
>
> > >     public void setText(String text) {
> > >         super.setText(text);
> > >     }
>
> > >     public MyLabel<T> object(T object) {
> > >         this.object = object;
> > >         if (objectText) {
> > >             updateObjectText();
> > >         }
> > >         return this;
> > >     }
>
> > >     public MyLabel<T> objectText() {
> > >         this.objectText = true;
> > >         updateObjectText();
> > >         return this;
> > >     }
>
> > >     public MyLabel<T> objectText(Formatter<T> formatter) {
> > >         this.formatter = formatter;
> > >         objectText();
> > >         return this;
> > >     }
>
> > >     private void updateObjectText() {
> > >         text(formatter.toString(object));
> > >     }
>
> > >     public T object() {
> > >         return object;
> > >     }
>
> > >     public MyLabel<T> absoluteTopPx(int topPx) {
> > >         Style style = getElement().getStyle();
> > >         style.setProperty("position", "absolute");
> > >         style.setPropertyPx("top", topPx);
> > >         return this;
> > >     }
>
> > >     public MyLabel<T> heightPx(int height) {
> > >         setHeight(height + "px");
> > >         return this;
> > >     }
>
> > >     public MyLabel<T> title(String title) {
> > >         setTitle(title);
> > >         return this;
> > >     }
>
> > > }
>
> > > On Jul 16, 1:29 pm, Jaroslav Záruba <[email protected]> wrote:
>
> > > > Could you post your MyLabel class?
>
> > > > On Fri, Jul 16, 2010 at 12:15 PM, evgenyk <[email protected]> wrote:
> > > > > I do not know where to add such assertion.
> > > > > I think I can't change anything.
> > > > > As far as I understand exception is thrown inside Label constructor.
>
> > > > > On Jul 16, 12:08 pm, Jaroslav Záruba <[email protected]>
> > > > > wrote:
> > > > > > I had the same issue - no problem in hosted mode, "this$static is
> > null"
> > > > > in
> > > > > > compiled. I found out I happen to call a method on null. Putting
> > couple
> > > > > of
> > > > > > not-null assertions into your code might help.
>
> > > > > > On Fri, Jul 16, 2010 at 10:49 AM, evgenyk <[email protected]>
> > wrote:
> > > > > > > Hello friends!
> > > > > > > I periodically get an exception thrown from the following
> > compiled
> > > > > > > code (not obfuscated version):
>
> > > > > > > function $MyLabel(this$static){
> > > > > > >  $setElement(this$static, ($clinit_73() ,
> > > > > > > $doc).createElement('div'));
> > > > > > >  (!!this$static.element || throwAssertionError_Object("This
> > > > > > > UIObject's element is not set; you may be missing a call to
> > either
> > > > > > > Composite.initWidget() or UIObject.setElement()") , this
> > > > > > > $static.element)['className'] = 'gwt-Label';
> > > > > > >  return this$static;
> > > > > > > }
>
> > > > > > > Java version:
> > > > > > > public class MyLabel extends Label {
> > > > > > >    public MyLabel(String text) {
> > > > > > >        super(text);
> > > > > > >    }
> > > > > > >    ... skipped other methods
> > > > > > > }
>
> > > > > > > Exception is thrown time after time in production environment on
> > > > > > > different client browsers with Firefox version 3.0.x on Windows
> > XP.
> > > > > > > It seems to me like a bug in FF. Is there any workaround, or I'm
> > doing
> > > > > > > something wrong?
> > > > > > > GWT version 2.0.3
>
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