This appears to be happening when you remove an item from the dataProvider. Is there anything unique about the dataProvider or how you're removing the item from the dataProvider?
- Dan Freiman On 10/24/07, Webdevotion <[EMAIL PROTECTED]> wrote: > > Hey everyone, > > I've been hunting a bug down for a while now in a Flex project: > > *This is the generated error:* > TypeError: Error #1009: Cannot access a property or method of a null > object reference. > *at > mx.controls.listClasses::ListBase/collectionChangeHandler()**[C:\dev\flex_201_gmc\sdk\frameworks\mx\controls\listClasses\ListBase.as:6496] > * > at mx.controls.listClasses::TileBase/collectionChangeHandler > ()[C:\dev\flex_201_gmc\sdk\frameworks\mx\controls\listClasses\TileBase.as:1981] > at flash.events::EventDispatcher/dispatchEventFunction () > at flash.events::EventDispatcher/dispatchEvent() > at mx.collections::ListCollectionView/dispatchEvent > ()[C:\dev\flex_201_gmc\sdk\frameworks\mx\collections\ListCollection > View.as:833] > at > mx.collections::ListCollectionView/moveItemInView()[C:\dev\flex_201_gmc\sdk\frameworks\mx\collections\ListCollectionVi > ew.as:1316] > at mx.collections::ListCollectionView/handlePropertyChangeEvents > ()[C:\dev\flex_201_gmc\sdk\frameworks\mx\collections\ListCollection > View.as:1124] > at mx.collections::ListCollectionView/listChangeHandler > ()[C:\dev\flex_201_gmc\sdk\frameworks\mx\collections\ListCollectionVi > ew.as:1042] > at flash.events::EventDispatcher/dispatchEventFunction() > at flash.events::EventDispatcher/dispatchEvent () > at mx.collections::ArrayList/internalDispatchEvent > ()[C:\dev\flex_201_gmc\sdk\frameworks\mx\collections\ArrayList.as:518] > at > mx.collections::ArrayList/itemUpdateHandler()[C:\dev\flex_201_gmc\sdk\frameworks\mx\collections\ArrayList.as:544] > > at flash.events::EventDispatcher/dispatchEventFunction() > at flash.events::EventDispatcher/dispatchEvent() > > > *The rule that throws the error* > // RULE 6493 in ListBase.as > //( found at : C:\Program Files\Adobe\Flex Builder 2 Plug-in\Flex SDK > 2\frameworks\source\mx\controls\listClasses ) > // make sure we've generated rows for the actual data > // at startup time we might just have blank rows > if (listItems.length && listItems[lockedRowCount].length ) > > *Screenshot* > For those interested, this is the dump of listItems: > screenshot<http://content.screencast.com/media/d25bbc5a-9b36-42ee-8393-b2e2f48929f8_8373bf5e-323c-46b9-94a3-68ac1e9fbb8f_static_0_0_image.png> > > > Any thought are greatly appreciated! > Bram > > > > > > > > >
