standalone desktop - loading mat file error

when i start the stand alone app and uploading mat file i get:

Warning: Variable 'lgraph_1' originally saved as a nnet.cnn.LayerGraph cannot be instantiated as an object and will be read in as a uint32.
Warning: Variable 'net' originally saved as a DAGNetwork cannot be instantiated as an object and will be read in as a uint32.
Warning: Variable 'options' originally saved as a nnet.cnn.TrainingOptionsSGDM cannot be instantiated as an object and will be read in as a uint32.
Error using classify (line 123)
Requires at least three arguments.

the code is:

[filename, pathname] = uigetfile({'*.mat'},'Choose Model - .mat File');
fullFileName = fullfile(pathname, filename); 
app.Model=load(fullFileName);

and the classify is:

label = classify(app.Model.net,img);

in appdesigner its work when i start the stnadalone its not working.