Error in fitcecoc (line 329) obj = Classifica​tionECOC.f​it(X,Y,eco​cArgs{:});

i use Deep learning for face recignition and svm as a cllasifier. when i run the program i got this :

Error using classreg.learning.classif.FullClassificationModel.processClassNames (line 176)

Requested class names are not found among passed class labels.

Error in classreg.learning.classif.FullClassificationModel.prepareData (line 492)

classreg.learning.classif.FullClassificationModel.processClassNames(...

Error in classreg.learning.FitTemplate/fit (line 213)

this.PrepareData(X,Y,this.BaseFitObjectArgs{:});

Error in ClassificationECOC.fit (line 116)

this = fit(temp,X,Y);

Error in fitcecoc (line 329)

obj = ClassificationECOC.fit(X,Y,ecocArgs{:});

Error in CNNFaceRec (line 95)

clf = fitcecoc(descriptors,lab,'Learners',t,'FitPosterior',1,...

what should i do ?

thank you