My header file looks like this:

import <SpriteKit/SpriteKit.h>

typedef NS_ENUM(NSUInteger, THSpaceDogType) { THSpaceDogTypeA = 0, THSpaceDogTypeB = 1 };

@interface THSpaceDogNode : SKNode

• (instancetype) spaceDogOfType: (THSpaceDogType)type;

@end

and my implementation file looks like this:

import "THSpaceDogNode.h"

@implementation THSpaceDogNode

• (instancetype) spaceDogOfType: (THSpaceDogType)type { THSpaceDogNode *spaceDog;

  if (type == THSpaceDogTypeA) { spaceDog = [self spriteNodeWithImageNamed: @"spacedog_A_1"]; } else { spaceDog = [self spriteNodeWithImageNamed: @"spacedog_B_1"];

  }

  return spaceDog; }

@end

However I get an error inside the if statement where the two lines make the sprite for the space dog enemies. it says, "No known class for method for selector 'spriteNodeWithImageNamed:'

That error is repeated twice. I have no idea what I did wrong, I went so far as to even delete the code, and start from the beginning of the video and it still says the same thing. Am I doing something wrong here?