Need help in resolving the simple cocos2d error

I am using following code to render the image on screen

-(id) init
{
    if( (self=[super init] )) {
        CGSize winSize = [[CCDirector sharedDirector] winSize];
        CCSprite *player = [CCSprite spriteWithFile:@"Player.png" rect:CGRectMake(0, 0, 27, 40)];
        player.position = ccp(player.contentSize.width/2, winSize.height/2);
        [self addChild:player];     
    }
    return self;
}

when I ran the code following error is coming

continue
2011-07-11 19:25:58.220 testcellapp[441:707] cocos2d: cocos2d v1.0.0-rc3
2011-07-11 19:25:58.229 testcellapp[441:707] cocos2d: Using Director Type:CCDirectorDisplayLink
2011-07-11 19:25:58.407 testcellapp[441:707] cocos2d: OS version: 4.3.1 (0x04030100)
2011-07-11 19:25:58.411 testcellapp[441:707] cocos2d: GL_VENDOR:   Imagination         Technologies
2011-07-11 19:25:58.415 testcellapp[441:707] cocos2d: GL_RENDERER: PowerVR SGX 535
2011-07-11 19:25:58.418 testcellapp[441:707] cocos2d: GL_VERSION:  OpenGL ES-CM 1.1       IMGSGX535-58.6
2011-07-11 19:25:58.423 testcellapp[441:707] cocos2d: GL_MAX_TEXTURE_SIZE: 2048
2011-07-11 19:25:58.427 testcellapp[441:707] cocos2d: GL_MAX_MODELVIEW_STACK_DEPTH: 16
2011-07-11 19:25:58.430 testcellapp[441:707] cocos2d: GL_MAX_SAMPLES: 4
2011-07-11 19:25:58.434 testcellapp[441:707] cocos2d: GL supports PVRTC: YES
2011-07-11 19:25:58.437 testcellapp[441:707] cocos2d: GL supports BGRA8888 textures: YES
2011-07-11 19:25:58.441 testcellapp[441:707] cocos2d: GL supports NPOT textures: YES
2011-07-11 19:25:58.444 testcellapp[441:707] cocos2d: GL supports discard_framebuffer: YES
2011-07-11 19:25:58.447 testcellapp[441:707] cocos2d: compiled with NPOT support: NO
2011-07-11 19:25:58.450 testcellapp[441:707] cocos2d: compiled with VBO support in TextureAtlas : NO
2011-07-11 19:25:58.454 testcellapp[441:707] cocos2d: compiled with Affine Matrix transformation in CCNode : YES
2011-07-11 19:25:58.457 testcellapp[441:707] cocos2d: compiled with Profiling Support: NO
2011-07-11 19:25:58.554 testcellapp[441:707] cocos2d: CCTexture2D. Can't create Texture. UIImage is nil
2011-07-11 19:25:58.558 testcellapp[441:707] cocos2d: Couldn't add image:Player.png in CCTextureCache
2011-07-11 19:25:58.564 testcellapp[441:707] *** Assertion failure in -[HelloWorldLayer addChild:], /Users/shahbazali/Documents/testcellapp/libs/cocos2d/CCNode.m:408
2011-07-11 19:25:58.601 testcellapp[441:707] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Argument must be non-nil'
*** Call stack at first throw:
(
    0   CoreFoundation                      0x32c3064f __exceptionPreprocess + 114
    1   libobjc.A.dylib                     0x31da4c5d objc_exception_throw + 24
    2   CoreFoundation                      0x32c30491 +[NSException raise:format:arguments:] + 68
    3   Foundation                          0x318a2573 -[NSAssertionHandler handleFailureInMet开发者_StackOverflow中文版hod:object:file:lineNumber:description:] + 62
    4   testcellapp                         0x00067c1c -[CCNode addChild:] + 196
    5   testcellapp                         0x000033ec -[HelloWorldLayer init] + 400
    6   testcellapp                         0x00066ca0 +[CCNode node] + 76
    7   testcellapp                         0x000031fc +[HelloWorldLayer scene] + 100
    8   testcellapp                         0x00002aac -[testcellappAppDelegate applicationDidFinishLaunching:] + 1028
    9   UIKit                               0x32f6a85d -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 832
    10  UIKit                               0x32f64b65 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 272
    11  UIKit                               0x32f397d7 -[UIApplication handleEvent:withNewEvent:] + 1114
    12  UIKit                               0x32f39215 -[UIApplication sendEvent:] + 44
    13  UIKit                               0x32f38c53 _UIApplicationHandleEvent + 5090
    14  GraphicsServices                    0x31118e77 PurpleEventCallback + 666
    15  CoreFoundation                      0x32c07a97 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 26
    16  CoreFoundation                      0x32c0983f __CFRunLoopDoSource1 + 166
    17  CoreFound

Please help why this error is coming

[CCNode addChild:] uses an NSAssert to let you know that the argument is not allowed to be nil. Make sure player is not nil.

Also note the lines in the log before the crash.

cocos2d: CCTexture2D. Can't create Texture. UIImage is nil
cocos2d: Couldn't add image:Player.png in CCTextureCache