TheOS iOS的UITableview代码在滚动时崩溃

I use TheOS to develop my jailbreak application. Here is my code of table view programmatically, I almost did the simplest way to implement the table view methods. The table view will show the default table data properly, but the app will crash when I scrolling the table view. my error log didn't show any obvious log. Please help me out, I really can't find out the reason why it will crash immediately while scrolling the view. to develop my jailbreak application