Why i am getting the error "Too many open files. Close files to prevent MATLAB instability."

Hello all, i am working on MCYT dataset and they have .fpg files. i have converted those file into .jpg files. now i am passing those images in to CNN but i am getting the error "Too many open files. Close files to prevent MATLAB instability. Caused by: Message Catalog MATLAB:FileIO was not loaded from the file. Please check file location, format or contents"

[user06]

I have resolved it by reading each image and close it by fclose command. this problem is occurring because of not closing the file when doing the conversion.

[Mayuri Kulkarni]

I am facing the same issue as stated in the problem. I am passing those .jpg images in to CNN which are read using

imageDatastore('path','IncludeSubfolders',true,'LabelSource','foldernames');

command using

fclose all

doesnot help.

i have read few answers about using opengl to solve this issue. https://in.mathworks.com/help/matlab/creating_plots/resolving-low-level-graphics-issues.html

but do not know how to implement the solution. does opengl helps to solve the error?

[Walter Roberson]

I would not expect changing to opengl to help this at all.

Something in the flow is failing to close files after use. It could be a bug. If you have a custom read function then you should check to be sure that it closes the file after it reads from it.

[Mayuri Kulkarni]

this is the bug in matlab2017a, so switching to matlab2017b or higher will help in this case

matlab bug reports

Answer 1

[Veera Kanmani]

The reason for the error messages is because the number of files that are open exceeds the limit on the maximum number of files that can be kept open.

While MATLAB does not have a limit on the maximum number of files that can be open, this is a restriction set by the operating system. Consult your system administrator for information on how to change this limit.

To resolve your issue, close every file with a FCLOSE command after using it. refer https://in.mathworks.com/matlabcentral/answers/101187-why-do-i-receive-too-many-files-open-error-messages-after-several-hours-when-executing-code-which