Struct contents reference from a non-struct array object.

my code tochange an image to gray using rgb2gray, had been running well until one day it begun displaying this message: Struct contents reference from a non-struct array object. a very simple code as the one below still has the same problem... am totally confused someone help me.

clc;
img = imread('img.jpg');
imshow(img);
img_gray = rgb2gray(img);
imshow(img_gray);

Answer 1

[madhan ravi]

clc;
img1 = imread('img.jpg');  % just try changing img variable to img1 not sure it would work but just a try
imshow(img1);
img_gray = rgb2gray(img1);
imshow(img_gray);

What does the below show ?

if it says it‘s a variable or you have a file with the same name as the any of the three below please rename it .

which imread -all 
which imshow -all
which rgb2gray -all
whos img   %  just try clear all at the very beginning and try again

[ENOC MOGEN]

Thanks for your prompt response

I came to realize that there was another code I had executed early in another folder and it somehow 'got stuck in memory' or something like that, because when I deleted the folder with that code, mine started working normal without having to change anything.

Thanks