First script of code for hidden message.m$\%$Ask the user for the image filenameimageFilename $=$ input$($ 'Enter the image filename $($including extension$)$: $,$s$\%$file name is flower. jpg$\%$Read the image into MATLAB using imreadImage $=$ imread $($imageFilename$)$ ;$\%$ Convert image to grayscale if necessary if size $($image$,3)==3$image $=$ rgb$2$gray $($image$)$;End$\%$ Search the image for existing values equal to zero and replace them with onesimage $($image $=0)=1$;$\%$ Ask the user for the message to embedmessage $=$ input$($ 'Enter the message to embed: $\text{'},\text{'}$s$\text{'})$;$\%$ Convert message to binarybinaryMessage $=\text{'}\text{'}$;for i $=1$: length $($message$)$binaryMessage $=$ strcat $($binaryMessage$,$ dec$2$bin $($message$($i$),8))$;$\%$ Convert binary message to array of charactersbinaryMessageChars $=$ num$2$cell $($binaryMessage$)$ ;$\%$ Create a matrix with the same size as the image to hold the binary messagebinaryMatrix $=$ zeros $($size $($image$,1),$ size$($image$,2),$ 'uint$8\text{'})$;$\%$ Put each letter of the string on a new row in the binary matrixfori$=1$:numel$($binaryMessageChars$)$binaryMatrix$($i$,1$:$8)=$ uint$8($str$2$double$($binaryMessageChars$\{$i$\}))$;End$\%$ Scan the binary matrix for values of $1$ and set the corresonding points inimage to zero $($black$)$Image$($binaryMatrix $==1)=0$;$\%$ Display the updated image imshow $($image$)$ ;title$($ 'Image with Hidden Message'$)$;Second script of code for decode message.m$\%$read the image fileimg $=$ imread $($ 'flower.jpg$\text{'})$;$\%$extract the binary message from the image message $=$;for i $=1$: size $($img$,1)$row $=$ img $($i$,$:$,$:$)$;for j $=1$:size $($img$,2)$pixel $=$ row$($j$,$:$)$;message $=$ strcat$($message$,$ num$2$str$($pixel $(1)))$ ;End End $\%$ convert the binary message to ascii charactersdecoded $\_$message $="$;for i $=1$:$7$length $($message$)$if i$+6<=$ length $($message$)$decoded$\_$message $=$strcat$($decoded$\_$message, char $($bin$2$dec$($message $($i: i$+6))))$;elsebreak;End End These are two different scripts of code, the first one used to hide a message into a picture uploaded and the second script to decode the message hidden in the picture. In my decode message.m script I get a message in my command window in Matlab saying index in position $1$ exceeds array bounds, and error in decodeMessage pixel $=$ row$($j$,$:$)$;

Why am I getting this error and fix the code