libpng error: No IDATs written into file

Question

Hi,

What i m doing is encoding the image with to Base64ForData and then uploading to server, the time of downloading decoding back.

I m getting "libpng error: No IDATs written into file " this error when trying to get NSData from UIImage.

NSData *d = UIImagePNGRepresentation(Record.photoimage);

Record.photoimage is UIImage.

But the same code working for some images and for some images i m getting this error.

Please help anyone....