error using ginput in matlab code

this is my code, and evevrytime i compile it, it shows error using ginput

%%Read in two images 
l = imread('pic410.bmp');
r = imread('pic430.bmp');

%%display image pair side by side
[ROWS, COLS, CHANNELS] = size(l);
disimg = [l r];
image(disimg);
% number of control points 
Nc = 10;
% Total Number of test points
Nt = 4;

%%After several runs, you may want to save the point matches 
%%in files (see below and then load them here, instead of 
%%clicking many point matches every time you run the program

%%load pl.mat pl;
%%load pr.mat pr;

%%interface for picking up both the control points and 
%%the test points

cnt = 1;
hold;

while(cnt <= Nc+Nt)

%%size of the rectangle to indicate point locations
dR = 50;
dC = 50;

%%pick up a point in the left image and display it with a rectangle....
%%%if you loaded the point matches, comment the point picking up (3 lines)%%%
[X, Y] = ginput(1);
Cl = X(1); Rl = Y(1);
pl(cnt,:) = [Cl Rl 1];

%%and draw it 
Cl= pl(cnt,1);  Rl=pl(cnt,2); 
rectangle('Curvature', [0 0], 'Position', [Cl Rl dC dR]);

%%and then pick up the correspondence in the right image
%%%if you loaded the point matches, comment the point picking up (three lines)%%%

[X, Y] = ginput(1);
Cr = X(1); Rr = Y(1);
pr(cnt,:) = [Cr-COLS Rr 1];

%%draw it
Cr=pr(cnt,1)+COLS; Rr=pr(cnt,2);
rectangle('Curvature', [0 0], 'Position', [Cr Rr dC dR]);
%plot(Cr+COLS,Rr,'r*');
drawnow;

cnt = cnt+1;
end

this is the error

Error using ginput (line 112)
Interrupted by figure deletion

Error in a4 (line 35)
[X, Y] = ginput(1);

please let me know who to solve this