Anyone knows what is this error about? the error doesn't show all the time.
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at mx.controls::AdvancedDataGrid/findHeaderRenderer()[E:\dev\4.5.1\frameworks\projects\advan cedgrids\src\mx\controls\AdvancedDataGrid.as:5866]
at mx.controls::AdvancedDataGrid/mouseEventToItemRenderer()[E:\dev\4.5.1\frameworks\projects \advancedgrids\src\mx\controls\AdvancedDataGrid.as:2155]
I building an ADG in a form, adding some dynamic columns after assign the dataprovider. I saw couple messages here with the same error but no solution.
This can be happen by using reference of unoccupied memory object. so try to find such reference that don't have new operator. and assign the new operator. also one more suggestion is that thus reference are available in file which is firing error, try to find that file in your code not SDK's in built code.
Best Of luck