when place into sencha touch 2.3 panel. "Cannot call method 'un' of undefined " error occurs

ref:
http://www.sencha.com/forum/showthread.php?239388-A-PDF-Viewer-Panel-No-Browser-Plugin-required-pure-JavaScript&p=1007175




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when place into sencha touch 2.3 panel. "Cannot call method 'un' of undefined " error occurs #7

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