Testing Data after Classification using test data in Classification App

Hi guys. I just trained my data and export the model. Now i want to use that data to test the testing data with the test data function in Classification App but i can't but the testing data into the import data set. Its said unable tofind suitable predictors or response in the selected variable. This is my code to import the data into workspace

% TRAINING

trainingData=readtable("ClassificationData2.xlsx")

% The first 4 columns are the inputs.

tPredictors = trainingData(:, 1:4);

% The last column is the "answer/ground truth".

tResponse = trainingData{:, end};

testingData=readtable("ClassificationTestData2.xlsx")

tTesting=testingData(:,1:4);

ttestResponse=testingData{:,end};

[Huy Cao]

@Image Analyst Can u help me with this pleaseeee ^^