¿La subclasificación de UITableViewCell da como resultado un error en el guión gráfico?

I have a strange error that is happening when I attempt to run my project. I am redesigning my old setup, which was a dedicated UITableViewController. I am moving that into a standard UIViewController with a UITableView inside of it.

Estoy recibiendo este error:

Command /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/ibtool failed with exit code 255

I narrowed down exactly what is causing it, but I have no idea why. It happens when I attempt to set the UITableViewCell within the tableview to be a custom UITableViewCell class that I created. Keep in mind that I used the exact same setup for my original UITableViewController. Why is the build failing with a Storyboard compiler error because I set the UITableViewCell to be a custom subclass?

EDIT 1 to add relevant code:

.h

@interface SingleCodeViewController : UIViewController <GADBannerViewDelegate, UITableViewDelegate>


@end

.m

@interface SingleCodeViewController ()

// Connected to the table view in IB
@property (weak, nonatomic) IBOutlet UITableView *tableView;

@end

@implementation SingleCodeViewController


- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(10, 0, 300, 30)];

    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(10, 0, 300, 30)];


    switch (section) {
        case 0:
            label.text = @"Date";
            break;
        case 1:
            label.text = @"Rate";
            break;
        default:
            break;
    }

    label.font = [UIFont boldSystemFontOfSize:17];
    label.shadowColor = [UIColor blackColor];
    label.shadowOffset = CGSizeMake(1.0, 1.0);

    label.textColor = [UIColor whiteColor];
    label.backgroundColor = [UIColor clearColor];

    [view addSubview:label];


    return view;
}


- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
    return 30.0;
}

// Sets the background for each static cell to be the same custom cell as the table view's.
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if ([cell isKindOfClass:[CodeCellTVC class]]) {
        if (![cell.backgroundView isKindOfClass:[CustomCellBackground class]]) {
            cell.backgroundView = [[CustomCellBackground alloc] init];
        }
    }
}


@end

My custom UITableViewCell class:

.h

@interface CodeCellTVC : UITableViewCell
@property (weak, nonatomic) IBOutlet UILabel *codeTableLabel;

@end

.m

// Empty implementation