That's a good question ... The application is quite big, I'll have to look into that. But yes, it occurs when I go back some screens and reset the dataprovider.
Thanks for that fresh insight. On 10/24/07, Daniel Freiman <[EMAIL PROTECTED]> wrote: > > 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\ListCollectionView.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\ListCollectionView.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 > > > > > > > > > > > > > > > > > >
