Hi,

I have a language selection menu in my application. When I try to switch 
the language, I get an error :

content is null (label.js line 333).

here is the detailed error report :
on()(qx.event.type.Data[up] $$hash=up _type=changeLocale)Label.js (line 333)
dispatchEvent()(qx.locale.Manager[5] $$hash=5 __translations=Object 
__locales=Object, qx.event.type.Data[up] $$hash=up _type=changeLocale, 
"changeLocale")Direct.js (line 99)
wrappedFunction()Interface.js (line 347)
dispatchEvent()(qx.locale.Manager[5] $$hash=5 __translations=Object 
__locales=Object, qx.event.type.Data[up] $$hash=up 
_type=changeLocale)Manager.js (line 642)
fireEvent()(qx.locale.Manager[5] $$hash=5 __translations=Object 
__locales=Object, "changeLocale", function(), ["de", "en_us" 0=de 
1=en_us])Registration.js (line 253)
(?)()("de")Pane.js (line 619)
(?)()()ToolBar.js (line 131)
dispatchEvent()(qx.ui.form.RadioGroup[7j] $$hash=7j __items=[4] 
$$user_name=lang, qx.event.type.Data[uo] $$hash=uo _type=changeSelected, 
"changeSelected")Direct.js (line 99)
wrappedFunction()Interface.js (line 347)
dispatchEvent()(qx.ui.form.RadioGroup[7j] $$hash=7j __items=[4] 
$$user_name=lang, qx.event.type.Data[uo] $$hash=uo 
_type=changeSelected)Manager.js (line 642)
fireEvent()(qx.ui.form.RadioGroup[7j] $$hash=7j __items=[4] 
$$user_name=lang, "changeSelected", function(), 
[qx.ui.menu.RadioButton[7r] $$hash=7r 
__containerElement=qx.html.Element[7s], qx.ui.menu.RadioButton[7k] 
$$hash=7k __containerElement=qx.html.Element[7l] 
0=qx.ui.menu.RadioButton[7r]])Registration.js (line 253)
(?)()Property.js (line 619)
_onItemChangeChecked()(qx.event.type.Data[1v] $$hash=1v 
_type=changeChecked)RadioGroup.js (line 302)
dispatchEvent()(qx.ui.menu.RadioButton[7r] $$hash=7r 
__containerElement=qx.html.Element[7s], qx.event.type.Data[1v] $$hash=1v 
_type=changeChecked, "changeChecked")Direct.js (line 99)
wrappedFunction()Interface.js (line 347)
dispatchEvent()(qx.ui.menu.RadioButton[7r] $$hash=7r 
__containerElement=qx.html.Element[7s], qx.event.type.Data[1v] $$hash=1v 
_type=changeChecked)Manager.js (line 642)
fireEvent()(qx.ui.menu.RadioButton[7r] $$hash=7r 
__containerElement=qx.html.Element[7s], "changeChecked", function(), 
[true, null 0=true])Registration.js (line 253)
(?)()Property.js (line 619)
_onMouseUp()(qx.event.type.Mouse[1ox] $$hash=1ox 
_type=mouseup)RadioButton.js (line 147)
_dispatchEvent()(qx.event.type.Mouse[1ow] $$hash=1ow _type=mouseup 
_target=label)EventHandler.js (line 264)
dispatchEvent()(label, qx.event.type.Mouse[1ow] $$hash=1ow _type=mouseup 
_target=label, "mouseup")Abstract...bbling.js (line 211)
dispatchEvent()(label, qx.event.type.Mouse[1ow] $$hash=1ow _type=mouseup 
_target=label)Manager.js (line 642)
fireEvent()(label, "mouseup", function(), [mouseup clientX=933, 
clientY=97, label, null, 2 more... 0=Event mouseup 1=label 3=true 
4=true])Registration.js (line 253)
__fireEvent()(mouseup clientX=933, clientY=97, "mouseup", label)Mouse.js 
(line 175)
_onButtonEvent()(mouseup clientX=933, clientY=97)Mouse.js (line 356)
(?)()()

How can I prevent this ?

regards
Amit Rana

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