Unrecognized variable name with selectLabels

2018 7 2
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Hi everyone,
I'm trying to create a thermal images face detection. So I used the Image Labeler App for creating my ground truth data.
After testing this code on my gTruth object:
imageDir = fullfile('Dataset', 'Balage', 'Expression', 'exp1');
addpath(imageDir);
load('gTruth.mat','gTruth');
faceGroundTruth = selectLabels(gTruth, 'Face');
I have this error :
Error using groundTruth/selectLabels (line 279) Unrecognized variable name 'Face'.
Error in classifier_test (line 8) faceGroundTruth = selectLabels(gTruth, 'Face');
I don't understand why, because after looking to gTruth.LabelDefinitions, 'Face' is defined...
Thank you in advance for you help !

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