Why do I get an "Error using matlabshar​ed.mldatx.​internal.g​etApplicat​ion" when my .mldatx application file is not placed in the current folder (but on the MATLAB search path) in Simulink Real-Time R2020a?

I have an issue with deploying my application to the target using the MATLAB API.

If I use the load command from the MATLAB API I get the error message:

Error using matlabshared.mldatx.internal.getApplication
Unable to read file 'my_model.mldatx'.

Error in https://protect-us.mimecast.com/s/kTXCAIEZB2hoz9QBF5KCTh?domain=simulinkrealtime.target

Error in testUI/DownloadButtonPushed (line 2345)
load(app.tg, 'my_model'); % Download application to target

The same application works if I use the external mode to deploy the application.

The file my_model.mldatx is on the project path, so it can be resolved. This was tested using

>> which('my_model.mldatx')

When I close the project and let Simulink create all build artifacts in the current folder, loading does work.

Answer 1

[MathWorks Support Team]

This happens because we either need to be in the directory where the application file is located when we call "tg.load', or we need to specify the relative/absolute path to the application. 

For instance, if you are working out of the "work" directory in your project and the application file is in the "codegen" sub-directory, you could call:

>> tg.load('codegen/sea_llc')

For example, you could use something like this in your code:

[pth,file] = fileparts(which('my_model.mldatx'));
load(app.tg, [pth,'\',file]);