得到NSInternalInconsistencyException

开发ios应用中，在tableView显示自定义单元的时候出现错误，我是用nibFile连接cell，

NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"CellForOffers" owner:self options:nil];

cell实现：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"CellForOffers";
    CellForOffers *cell =(CellForOffers *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {

        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"CellForOffers" owner:self options:nil];
        cell = [nib objectAtIndex:0];


        appDC * application = [dataArray objectAtIndex:[indexPath row]];

        cell.namelbl.text=application.o_name;

        cell.descriptionlbl.text=application.o_description;

        [cell.imageView setImageWithURL:[NSURL URLWithString:application.o_image_url]];


    }

    return cell;
}