add tab not working after upgrade from ext.net 4.1 to 4.8.3

simply i update ext.net on my main project then add tab is not working now given the following error :

Code:

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Uncaught ReferenceError: newTab is not defined
    at ctor.fn ((index):241)
    at ctor.fire (ext.axd?v=4.8.3:20)
    at ctor.doFireEvent (ext.axd?v=4.8.3:20)
    at ctor.doFireEvent (ext.axd?v=4.8.3:20)
    at ctor.b.doFireEvent (ext.axd?v=4.8.3:20)
    at ctor.fireEventArgs (ext.axd?v=4.8.3:20)
    at ctor.fireEvent (ext.axd?v=4.8.3:20)
    at ctor.setActiveTab (ext.axd?v=4.8.3:20)
    at ctor.doActivateTab (ext.axd?v=4.8.3:20)
    at ctor.onClick (ext.axd?v=4.8.3:20)

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