Need help in creating QR scanner app using MATLAB app designer

Hi!

I'm new to MatLab and I'm trying to create an app that reads barcodes or QR codes. What it does is basically read barcodes and QR codes using a webcam and display the output in a text area. The script worked when I used it on a command window.

Now I need to apply in on an app, the files are attached here. When I tried to run the app I get an error that says "Error using disp, too many output arguments". I have spent hours trying to find a solution but can't find any.

clc;
cam=webcam(1);
preview(cam);
while(1)
    img=snapshot(cam);
    msg=readBarcode(img);
    disp(msg);
end

No webcams have been detected. Please ensure the webcam is connected to the system.

[Phan Cuong]

You should instal the Webcam package in Matlab Service