this class is not key value coding-compliant for the key error

@property(nonatomic,strong) NSString *teamName;
@property(nonatomic,strong) NSString *thumbnail;

-(instancetype)initClubWithName:(NSString *)name;
-(NSURL *)thumbnailUrl; 

-(instancetype)initClubWithName:(NSString *)name{

    self = [super init];

    if(self){
        self.teamName = name;
        self.thumbnail = nil;
    }

    return self;
}

- (NSURL *)thumbnailUrl {
    return [NSURL URLWithString:self.thumbnail];
}

#import <UIKit/UIKit.h>
#import "Club.h"
#import "Data.h"

@interface ClubsTableViewController : UITableViewController

@property(nonatomic,strong) Data *holderData;
@property(nonatomic,strong) NSMutableArray *clubs;

@end

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.holderData = [[Data alloc]init];
    self.clubs = [[NSMutableArray alloc] init];

    [self.holderData loadDataWithCompletionBlock:^(NSDictionary *objects) {

        NSArray *teams = [objects objectForKey:@"clubs"];

        for (NSDictionary *c in teams ) {
            Club *club = [[Club alloc] initClubWithName:[c objectForKey:@"name"]];
            club.thumbnail = [c objectForKey:@"image"];
            [self.clubs addObject:club];
        }

        [self.tableView reloadData];

    }];

}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{

    if([segue.identifier isEqualToString:@"clubsDetail"]){


        NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
        Club *clubs = [self.clubs objectAtIndex:indexPath.row];

        [segue.destinationViewController setClubName:clubs.teamName];


    }
} 

@interface DetailViewController : UIViewController

@property (strong, nonatomic) IBOutlet UILabel *clubLabel;
@property (strong,nonatomic) NSString *clubName;

@end

@synthesize clubLabel,clubName;

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.clubLabel = [[UILabel alloc] init];
    self.clubName = [[NSString alloc] init];

    self.clubLabel.text = clubName;
}