Hi,
The sessionFile will load the saved session that you have saved using the app.
The reason behind the error message you are getting is probably because the argument you are passing is not a proper Session object. If you will load the sessionFile (MAT-File) into your workspace by using the command
load('groundTruthLabelingSession1.mat');
A variable called groundTruthLabelingSession gets loaded into your workspace. To know the path to the ground truth from the session object, you can do
groundTruthLabelingSession
after loading the sessionFile into workspace.
If you have generated the MAT-file using Export labels button, it will save a groundTruth object as MAT-file. You may not be able to directly use this object to launch the app.
Best Answer