error free code fmd v1

clc

close all;
cam=webcam(1);

e=cam.snapshot;
FDetect=vision.CascadeObjectDetector('Mouth','MergeThreshold',100);
I=e;
BB_Mouth=step(FDetect,I);
imshow(I);
hold on;
%%
FDetect=vision.CascadeObjectDetector('Nose','MergeThreshold',16);
I=e;
BB_Nose=step(FDetect,I);
imshow(I);
hold on;
if(sum(sum(BB_Nose))==0 && sum(sum(BB_Mouth))==0)
    FDetect=vision.CascadeObjectDetector('FrontalFaceLBP','MergeThreshold',10);
    BB_Mouth=step(FDetect,I);
    if(sum(sum(BB_Mouth))~=0)
    title('Remove Hand Please');
    defaultString = 'Remove Hand from face.';
    NET.addAssembly('System.Speech');
    obj = System.Speech.Synthesis.SpeechSynthesizer;
    obj.Volume = 100;
    Speak(obj, defaultString);
    else
    title('Mask Present');
    defaultString = 'Thank You for wearing Mask.';
    NET.addAssembly('System.Speech');
    obj = System.Speech.Synthesis.SpeechSynthesizer;
    obj.Volume = 100;
    Speak(obj, defaultString);
    end
elseif((sum(sum(BB_Nose))~=0 && sum(sum(BB_Mouth))==0)||(sum(sum(BB_Nose))==0 && sum(sum(BB_Mouth))~=0))
   for i=1:size(BB_Nose,1)
   rectangle('Position',BB_Nose(i,:),'Linewidth',5,'LineStyle','-','EdgeColor','r');
   end
   for i=1:size(BB_Mouth,1)
   rectangle('Position',BB_Mouth(i,:),'Linewidth',5,'LineStyle','-','EdgeColor','r');
   end
    title('Please wear mask properly');
    defaultString = 'Please wear mask properly.';
    NET.addAssembly('System.Speech');
    obj = System.Speech.Synthesis.SpeechSynthesizer;
    obj.Volume = 100;
    Speak(obj, defaultString);
else
   for i=1:size(BB_Nose,1)
   rectangle('Position',BB_Nose(i,:),'Linewidth',5,'LineStyle','-','EdgeColor','r');
   end
   for i=1:size(BB_Mouth,1)
    rectangle('Position',BB_Mouth(i,:),'Linewidth',5,'LineStyle','-','EdgeColor','r');
    end
    title('Please wear Mask');
    defaultString = 'Please wear Mask.';
    NET.addAssembly('System.Speech');
    obj = System.Speech.Synthesis.SpeechSynthesizer;
    obj.Volume = 100;
    Speak(obj, defaultString);
end