Two different cell types in one UITableView

Hi everyone, I am very confused about how to use two different types of cells in one UITableView with two sections. The first section should return a large cell with a lot of text, the other section should return three cells to go to other views. I tried this as follows:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    //NSUInteger section;
    static NSString *CellIdentifier1 = @"CellIdentifier";
    static NSString *CellIdentifier2 = @"Cell";

    if (indexPath.section == 0) {

        CustomTableCell *cell = (CustomTableCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier1];
        if (cell == nil)
        {
            [[NSBundle mainBundle] loadNibNamed:@"CustomTableCell" owner:self options:nil];     cell = [self customTableCell];
            [self setCustomTableCell:nil];
        }
        return cell;
    }
    else if (indexPath.section == 1) {

            cTableViewCell *cell = (cTableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier2];
            if (cell == nil)
            {
                [[NSBundle mainBundle] loadNibNamed:@"cTableViewCell" owner:self options:nil];
                cell = [[cTableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier2];
                [self setCustomTableCell:nil];
            }
            // Configure the cell...
            NSUInteger row = [indexPath row];
            cell.textLabel.text = [array objectAtIndex:row];
            return cell;            
        }
    return cell;
}

I set the height for the cells in the sections here:

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSUInteger section;
    if (section == 0) {
        return [indexPath row] + 80;
    }
    else 
    {
        return [indexPath row] + 44;
    }

}

I get this error: "cell" uneclared (use this function first). :( I really hope you could help me. Thanks in advance