the usage of 'imwrite'

I run a code in matlab 2011.the code is used to write a PNG file to disk.But there is an error says "Error using pngwritec,PNG library failed:write error".The code is to long ,so I take the error part on here.the error part are as follows:

[Walter Roberson]

Duplicates https://www.mathworks.com/matlabcentral/answers/319012-code-useage-in-pngwritec

[longxia]

"This question is closed and may reopen in the future if edited."I can't open it.Do you know the reason,please tell me directly.