Creating a new object throws copywithzone unrecognized selector error in iOS

I have a simple object that looks like this:

#import <Foundation/Foundation.h>
#import <Parse/Parse.h>

@class MyUser;

@interface MyCycle : NSObject


@property (nonatomic, copy) NSNumber *myNumber;
@property (nonatomic, strong) MyUser *user;
@property (nonatomic, strong) NSArray *data;


@end

Here is the implementation:

#import "MyCycle.h"

@implementation MyCycle



@end

Here is the user object:

#import <Foundation/Foundation.h>
#import <Parse/Parse.h>


@interface MyUser : NSObject

@property (nonatomic, copy) NSString *usersName;
@property (nonatomic, copy) NSString *gender;
@property (nonatomic, copy) NSString *email;
@property (nonatomic, copy) NSString *password;
@property (nonatomic, copy) NSString *phoneNumber;
@property (nonatomic, strong) UIImage *profileImage;
@property (nonatomic, strong) PFFile *profileImageFile;




@end

I select this object and fill it as follows:

MyCycle *cycle = [[MyCycle alloc] init];
        cycle.myNumber = @1;
        cycle.data = [[NSArray alloc]init];

I get the following error:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[MyCycle copyWithZone:]: unrecognized selector sent to instance

Why is this happening and how can I fix it?