Create PVR texture from png file

Hi,
I have one image file in png format. I want to create texture out of that image. To convert into texture format .pvr I am using following command:
$ ./texturetool -e PVRTC -o ./image.pvr ./image.png
image.pvr file is getting created but with zero bytes file size. I loaded and tested it nothing comes blank screen.
Please tell me syntax of conversion from png or jpg to .pvr.
Regards,
Ganesh Pisal
Vavni Inc

I am using this code to load created texture:
NSString *path = [[NSBundle mainBundle] pathForResource:@"image" ofType:@"pvr"];
NSData *data = [NSData dataWithContentsOfFile:path];
textures[kTextureone] = [[Texture2D alloc] initWithData:[data bytes] pixelFormat:kTexture2DPixelFormatRGBAPVRTC4 pixelsWide:512 pixelsHigh:512 contentSize:CGSizeMake(512,512)];
Not getting texture.

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