[RDG]

I'm getting this error:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[CALayerArray drawInContext:]: unrecognized selector sent to instance 0xd1b2f0'

only when I call a method of the class TBLevel in the drawRect: method of TBView.

Here's the code:

TBLevel.h

Code:
#import <Foundation/Foundation.h>

#ifndef _TB_OBJ
#define _TB_OBJ

typedef struct
{
	CGImageRef image;
	BOOL isObject;
} TBObject;

#endif

@interface TBLevel : NSObject
{
	int _width;
	int _height;
	
	int _playerX;
	int _playerY;
	
	TBObject **cells;
	
	CGContextRef context;
}
+ (id)levelWithWidth:(int)width height:(int)height playerX:(int)playerX andPlayerY:(int)playerY;
- (id)initWithWidth:(int)width height:(int)height playerX:(int)playerX andPlayerY:(int)playerY;
- (void)insertObject:(TBObject)obj atPoint:(CGPoint)loc;
- (void)drawInContext:(CGContextRef)ctxt;

- (int)width;
- (int)height;
@end

TBlevel.m

Code:
#import "TBLevel.h"

@implementation TBLevel

+ (id)levelWithWidth:(int)width height:(int)height playerX:(int)playerX andPlayerY:(int)playerY
{
	return [[[TBLevel alloc] initWithWidth:width height:height playerX:playerX andPlayerY:playerY] autorelease];
}

- (id)initWithWidth:(int)width height:(int)height playerX:(int)playerX andPlayerY:(int)playerY
{
	_width = width;
	_height = height;
	
	_playerX = playerX;
	_playerY = playerY;
	
	cells = (TBObject **)malloc(sizeof(TBObject *) * width);
	
	for (int i = 0; i < width; i++)
	{
		cells[i] = (TBObject *)malloc(sizeof(TBObject) * height);
	}
	
	return self;
}

- (void)drawInContext:(CGContextRef)ctxt
{
	context = ctxt;
	
	for (int i = 0; i < _width; i++)
	{
		for (int j = 0; j < _height; j++)
		{
			CGImageRef image = cells[i][j].image;
			CGRect imgRect = CGRectMake(i * 32, j * 32, 32, 32);
			CGContextDrawImage(context, imgRect, image);
			CGImageRelease(image);
		}
	}
}

- (void)insertObject:(TBObject)obj atPoint:(CGPoint)loc
{
	cells[(int)loc.x][(int)loc.y] = obj;
}

- (int)width
{
	return _width;
}

- (int)height
{
	return _height;
}

- (void)dealloc
{
	free(cells);
	cells = NULL;
	CGContextRelease(context);
	[super dealloc];
}

@end

TBView.m

Code:
#import "TBView.h"

@implementation TBView

- (id)initWithCoder:(NSCoder *)coder
{
	if (self = [super initWithCoder:coder])
	{
		level = [TBLevel levelWithWidth:10 height:10 playerX:2 andPlayerY:1];
		
		TBObject obj;
		obj.image = [UIImage imageNamed:@"test.png"].CGImage;
		obj.isObject = YES;
		
		[level insertObject:obj atPoint:CGPointMake(0, 1)];
		
                //Notice the above method call (it doesn't generate an exception)

		playerView = [[TBPlayerView alloc] initWithFrame:CGRectMake(144, 144, 32, 32)];
		tallObjectsView = [[TBTallObjectsView alloc] initWithFrame:self.frame];
		
		[self addSubview:playerView];
		[self addSubview:tallObjectsView];
	}
	
	return self;
}

- (void)drawRect:(CGRect)rect
{
	[[UIColor blackColor] set];
	UIRectFill(rect);
	
	[level drawInContext:UIGraphicsGetCurrentContext()]; //This is the method call that generates the exception, if I put [level drawInContext:NULL] in the initWithCoder: method, it works
	[playerView setNeedsDisplay];
	[tallObjectsView setNeedsDisplay];
}

- (void)dealloc
{
	[super dealloc];
}

@end

Notice the comments in TBView.m.
If I call a method of level from initWithCoder: nohthing happens, but if I call it from drawRect: I get an exception.

Am I missing something?