Error in webcam_obj​ect_classi​fication when using full HD webcam

Hi,

I got trouble to use a full HD stream webcam in MATLAB R2018a. Here are the coding,

clear
% Connect to the camera
camera = webcam;

% Load the detector
load('detector1k')

% Preview video stream from the device

while true
	picture = camera.snapshot;                     % Take a picture 
      label = classify(detector1k, picture);         % Classify the picture
      
      image(picture);
      title(char(label)); 
end

and the error,

Dot indexing is not supported for variables of this type.

Error in webcam_object_classification (line 13)
    picture = camera.snapshot;              % Take a picture     

Any kind of help will be appreciated. Thank you.