Hello ! Since 5 days a have a problem and I am unable to handle
it.   S this Is what I have:
     A tree menu with 5 static nodes.  I use the tree to navigate 5
panels contained into a viewStack. when I am trying to change the
viewstack to the 3-rd panel I get in the browser the error shown down
of the page.
   But this happens only sometimes. There are cases when everything
works fine without changing anything in the code (Only rebuid it).   
   "Variable _ is not defined".   There is no variable name.


Please help me !!

:(


ReferenceError: Error #1065: Variable  is not defined.
        at global/flash.utils::getDefinitionByName()
        at mx.utils::DescribeTypeCache$/describeType()
        at mx.utils::ObjectUtil$/getClassInfo()
        at mx.controls::DataGrid/::generateCols()
        at mx.controls::DataGrid/mx.controls:DataGrid::collectionChangeHandler()
        at mx.controls.listClasses::ListBase/set dataProvider()
        at mx.controls::DataGrid/set dataProvider()
        at mx.core::Container/createComponentFromDescriptor()
        at mx.core::Container/createComponentsFromDescriptors()
        at mx.core::Container/mx.core:Container::createChildren()
        at mx.core::UIComponent/initialize()
        at mx.core::Container/initialize()
        at
mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::childAdded()
        at
mx.core::Container/http://www.adobe.com/2006/flex/mx/internal::childAdded()
        at mx.core::Container/addChildAt()
        at mx.core::Container/addChild()
        at mx.core::Container/createComponentFromDescriptor()
        at mx.core::Container/createComponentsFromDescriptors()
        at mx.core::Container/mx.core:Container::createChildren()
        at mx.core::UIComponent/initialize()
        at mx.core::Container/initialize()
        at
mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::childAdded()
        at
mx.core::Container/http://www.adobe.com/2006/flex/mx/internal::childAdded()
        at mx.core::Container/addChildAt()
        at mx.core::Container/addChild()
        at mx.core::Container/createComponentFromDescriptor()
        at mx.core::Container/createComponentsFromDescriptors()
        at mx.core::Container/mx.core:Container::createChildren()
        at mx.core::UIComponent/initialize()
        at mx.core::Container/initialize()
        at
mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::childAdded()
        at
mx.core::Container/http://www.adobe.com/2006/flex/mx/internal::childAdded()
        at mx.core::Container/addChildAt()
        at mx.core::Container/addChild()
        at mx.core::Container/createComponentFromDescriptor()
        at mx.core::Container/createComponentsFromDescriptors()
        at mx.core::Container/mx.core:Container::createChildren()
        at mx.core::UIComponent/initialize()
        at mx.core::Container/initialize()
        at
mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::childAdded()
        at
mx.core::Container/http://www.adobe.com/2006/flex/mx/internal::childAdded()
        at mx.core::Container/addChildAt()
        at mx.core::Container/addChild()
        at mx.core::Container/createComponentFromDescriptor()
        at mx.core::Container/createComponentsFromDescriptors()
        at mx.core::Container/mx.core:Container::createChildren()
        at mx.core::UIComponent/initialize()
        at mx.core::Container/initialize()
        at
mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::childAdded()
        at
mx.core::Container/http://www.adobe.com/2006/flex/mx/internal::childAdded()
        at mx.core::Container/addChildAt()
        at mx.core::Container/addChild()
        at mx.core::Container/createComponentFromDescriptor()
        at mx.core::Container/createComponentsFromDescriptors()
        at mx.containers::Panel/createComponentsFromDescriptors()
        at mx.core::Container/mx.core:Container::createChildren()
        at mx.containers::Panel/mx.containers:Panel::createChildren()
        at
no.Instore.Components::ToolboxPanel/no.Instore.Components:ToolboxPanel::createChildren()
        at mx.core::UIComponent/initialize()
        at mx.core::Container/initialize()
        at no.Instore.PlayerManagement.PlayerDetails::PlayerDetails/initialize()
        at
mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::childAdded()
        at
mx.core::Container/http://www.adobe.com/2006/flex/mx/internal::childAdded()
        at mx.core::Container/addChildAt()

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