Errors in app designer 2020b

I created a GUI in apdesigner a while back (possibly in v2019b). I tried to re-run it in v202b and it fails to run. I get the following error messages (XXXXXXXX refers to my application):

Unable to resolve the name matlab.apps.internal.GraphicsCallbackProxy.

Error in appdesigner.internal.service.AppManagementService (line 36)

obj.CallbackProxy = matlab.apps.internal.GraphicsCallbackProxy;

Error in appdesigner.internal.service.AppManagementService.instance (line 45)

obj = appdesigner.internal.service.AppManagementService();

Error in matlab.apps.AppBase/registerApp (line 47)

ams = appdesigner.internal.service.AppManagementService.instance();

Error in XXXXXXXX (line 596)

registerApp(app, app.LocationErrorMapUIFigure)

I then created a new empty GUI in appdesigner and when trying to run it I get similar errors.

I have tried a posted solution:

rehash toolboxcache

without success.

[Benjamin Thompson]

Can you post the app designer files?

[Carlos S]

No. App designer files (.mlapp) are binary so can't be posted. Also this error is occurring even with an empty GUI.

[Benjamin Thompson]

You can post binary files including mlapp. There is a size limit for files but this type should not be a problem.

[Carlos S]

See posted dummy app (one edit field, one button). I get the following error when running:

Warning: The following error was caught while executing 'matlab.apps.AppBase' class destructor:

Unable to resolve the name matlab.apps.internal.GraphicsCallbackProxy.

Error in appdesigner.internal.service.AppManagementService (line 36)

obj.CallbackProxy = matlab.apps.internal.GraphicsCallbackProxy;

Error in appdesigner.internal.service.AppManagementService.instance (line 45)

obj = appdesigner.internal.service.AppManagementService();

Error in matlab.apps.AppBase/delete (line 9)

ams = appdesigner.internal.service.AppManagementService.instance();

Error in app1 (line 50)

createComponents(app)

> In app1 (line 50)

Unable to resolve the name matlab.apps.internal.GraphicsCallbackProxy.

Error in appdesigner.internal.service.AppManagementService (line 36)

obj.CallbackProxy = matlab.apps.internal.GraphicsCallbackProxy;

Error in appdesigner.internal.service.AppManagementService.instance (line 45)

obj = appdesigner.internal.service.AppManagementService();

Error in matlab.apps.AppBase/registerApp (line 47)

ams = appdesigner.internal.service.AppManagementService.instance();

Error in app1 (line 53)

registerApp(app, app.UIFigure)

Answer 1

[prabhat kumar sharma]

Hi Carlos,

I understand that you are facing an issue while running the app using MATLAB App Designer. I have tried to reproduce the issue with the “app1.mlapp” file you shared, and it appears that the application worked correctly on my side.

I believe that this issue could be caused by one of the following reasons:

1.Please ensure that the path to your new application is added to MATLAB. It can be done as follows:

1. Launch MATLAB.
2. Navigate to your file in current folder.
3. Right click on your file and select “Add to path > Selected File”.

2. The error you are receiving is usually caused by MATLAB having a pathing error. To resolve this error, please run the following commands in MATLAB in order:

restoredefaultpath
savepath

I hope this information helps you resolve the issue you are experiencing.

Best regards,

Prabhat Sharma