Below is the code am using ```Swift let creatorProvider = BasicProvider( dataSource: dataSource, viewSource: ClosureViewSource( viewGenerator: { (data, index) -> CreatorsCollectionViewCell in return CreatorsCollectionViewCell.init() }, viewUpdater: { (cell: CreatorsCollectionViewCell, data, index) in cell.initData(user: data) }), sizeSource: { index, data, collectionSize in // 2. return size for each StoryItemCell here return CGSize(width: 64, height: 64) }) ```