I opened the file in a newer version of MATLAB, I think it was 2017a and the upgrade procedures which shows when you open a project from an older Matlab version in new one, fixed my project file.
AppDesigner Project not Opening
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Ibrahim Essam
on 21 Mar 2017
Answered: Ibrahim Essam
on 19 Jan 2018
i was just working on my appdesigner project and i don't remember editing any settings i just added a simple line of code to send message by CAN . now the project runs normally but when i try to open it in appdesigner to edit the code it doesn't open while all the other projects files opens normally , it just show me empty screen
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/161958/image.png)
i restarted the laptop and matlab and it still doesn't work
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Walter Roberson
on 22 Mar 2017
Some people have been able to recover appdesigner use if they rename their prefdir -- that is, a preference might have messed something up.
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Dmitry
on 28 Sep 2017
Same problem here with 2017b. The file runs ok with double click, but won't open in AppDesigner. I can also unzip it and read all content, so I guess it is not corrupted.
Neil
on 18 Jan 2018
I am having the same problem. mlapp file was created in 2016b and modified in 2017a. Tested on 2 computers with 2017a...runs and opens fine. Tested on 2 computers with 2017b...runs fine but won't open. Dialog box saying 'Error loading XXXX.mlapp' but no other information.
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