Error when trying to display an gif image in matlab

i'm tried to display gif image but i got the following error

for k=1:7
[img,map] = imread('animate.gif','frames',k);
save(sprintf('img%d.mat',k),'img');
save('map.mat','map');
figure;
implay(img,map);
end

Error using readgif>read_multiframe_gif (line 70)
Java exception occurred:
java.lang.ArrayIndexOutOfBoundsException

Error in readgif (line 32)
[X,map] = read_multiframe_gif(filename);

Error in imread (line 415)
    [X, map] = feval(fmt_s.read, filename, extraArgs{:});