App Designer: Can't delete Figure "app.UIAxes" permanently

I have an app in App Designer and put an Component called UIAxes on the canvas. Now I want to delete it. I can delte it, but after saving and loading its back. How to fix this?

[Ajay Kumar]

Are you getting any error message in command window?

[Adam Danz]

"I can delete it, but after saving and loading its back."

How are you deleting it? From the AppDesigner user interface or programmatically from within the code?

[Mash]

When loading the programm within App Designer, there is no error. When I pusth run, there is an error, as the Ui.Axes is quite broken within the code. I put the error and code in the Screenshot.

I delte it by right clicking it in the component Browser and pushing delete. By default, the code is not editable created by the Design Viewer.

Thanks for you quick asking. I am ofline for today and I am back in 16 hours.

[Adam Danz]

I understand the problem (though, not the cause of the problem).

When you reopen the app and the deleted UIAxes is back again, does line 18 still cause an error?

Could you put the mlapp file in a zip file and attach it?

[Mash]

.rar is not attachable, but I put the .mlapp in the attachment.

I was a bit careless about the thema, as I was to lazy to put up git, instead used used a a numbering like 1.6. But the last version without running the prbolem is two days old.

Yes. line 18 causes an error as long I do not delete UIAxes in the same session. After deletion, the app runs smooth.

I minimalized the problem and deleted most of the code that is not from App.Designer set. Thanks for having a look onto it.

Error message in command window: 'Error using Verschleissberechnung_2_3
Error: File: Verschleissberechnung_2_3.mlapp Line: 18 Column: 47
Invalid use of operator.'

Answer 1

[Adam Danz]

This is really bizarre.

Source of the problem

The problem is caused by the 2nd UIAxes not having a handle assigned in the app. Open the app in appdesigner and look at the Component Browser. I have no idea how this happened. Do you have any recollection of how this happened?

Solution

First, store a backup of your app.

1) Right-click the component in the image above, select "Rename" and provide it with a unique handle name (I've named it UIAxes2).

2) After doing step 1, the handle to the UIAxes will now be represented in the properties section in code-view. However, this causes another very odd problem. The name you assign to the axes will appear on every line of editable code in your app. You must remove all of those lines (you can use ctrl+f to find & replace). Then save the app and the problem should be fixed.

I'm using r2019b (update 2).

I've reported this to the tech team and have attached your modified app to my answer so they can access it (Case #04114127).

[Mash]

Thanks. That was a weird thing. I colud have got the idea to rename it myself, as I have seen the broken handle.

I was searching for component to show some data. But I didn't already know what I was looking for exactly, so I put a few things on the canvas and deleted the useless ones again. But the UI.Axes came back the next day at the restart. I just deleted it again. Next day the same, but I only got that it was a regulary bug, as I closed the app designer during the work flow and not only over night. So I do not really know what went wrong.

[Mustafa]

I had the same problem and fixed it now. Thanks!

[Adam Danz]

Thanks for the feedback, Mustafa. It's good to know the solution is generalizable.