check line 178 in image-watermark.php
getimagesize($upload_dir[‘path’].DIRECTORY_SEPARATOR.$_REQUEST[‘)
when getimagesize , the file is still uploading ( i guess it happens if the file is large ), it will throw an warning ( the path is hidden )
[08-May-2013 07:24:19 UTC] PHP Warning: getimagesize( /…… //dfactory-53eb.kxcdn.com/wp-content/uploads/2013/05/b213c03515edc23116e3TsQwV4RE0y8m.jpg ): failed to open stream: No such file or directory in /……. /web/fun.chillrain.com/wp-content/plugins/image-watermark/image-watermark.php on line 178