This app was created in a newer version of App Designer and cannot be opened for editing

Hi there,

I'm currently working with MATLAB 2017b and using App Designer to develop a simple app. The problem raised when I asked my friend to complete a part of the code on his PC. Everything were working well there but when I tried to open the completed code (.mlapp file) in my version I got the following error:

"This app was created in a newer version of App Designer and cannot be opened for editing"

Any idea except updating the whole MATLAB to 2018 version, will be greatly helpful!

Answer 1

[Melissa Williams]

There was a change made between 17b and 18a to the way App Designer saves an app. Your friend on the newer release can

• go to the Save drop down menu in App Designer and select "Save Copy As".
• Inside the save dialog, on the Save As Type drop down, select R2017b and save.

You'll need to repeat this any time he makes a change but this is only for switching back to releases prior to 18a, you wouldn't need to do this if say he were on 18b and you were on 18a. Hope this helps!

[Mart]

I do not have this option, how to get it?

It only allowes me to save as an MATLAB App

Using 2019 myself

[Melissa Williams]

You need to select the "Save Copy As" option from the Save button drop down.

Please note, you only need this option if you wish to open your 2019a app in a MATLAB release older than 2018a.

[cherry jain]

It shows that my app has some features that will only work in 2019.

[Krzysztof]

Hi, I am trying to save my app created using Matlab R2023a so it could be used by a user with Matlab R2016a, but even though I use "save copy as" button there is no possibility to choose older versions of .mlapp? Can you help me please?