problem in splitting video into frames using matlab

Here is my code :

video = VideoReader('Engineer.mp4');

NbOfImages = 30;

for img = 1:NbOfImages;

data = read(video, img);

filename=strcat('image',num2str(img),'.jpg');

listOfImages(img) = {filename};

imwrite(data, filename);

end

imageNames = listOfImages';

Works fine on matlab 2013a, but when i try to run it on matlab 2015b it gives me this error :

Error using VideoReader/read (line 160)

The frame index requested is beyond the end of the file.

Error in tp2 (line 9)

data = read(video, img);