clientWidth is a DOM element property, the error is probably caused by 
trying to read it on something that isn't an element. Could be a timing 
problem caused by a call like

document.getElementById("foo").clientWidth

where the element doesn't exist (yet).

Try disabling all optimizations[1] and building again, that should give 
you a usable stack trace.

[1]http://manual.qooxdoo.org/current/pages/tool/generator_config_ref.html#pages-tool-generator-config-ref-compile-options

On 08/13/2012 10:10 AM, Arxae wrote:
> I get this message after i issued a build action to my app and launch the
> builded one.
>
> The debug version of my app works witouth a problem. How can i fix this?
>
>
>
> --
> View this message in context: 
> http://qooxdoo.678.n2.nabble.com/Unable-to-get-value-of-the-property-clientWidth-after-build-tp7580966.html
> Sent from the qooxdoo mailing list archive at Nabble.com.
>
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------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
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