Week 2- 2R Robotic Arm Challenge

%multiposition of arm
theta1=linspace(0,90,4);
theta2=linspace(0,90,4);

l1=1
l2=0.5
ct=1;

for i= 1:length(theta1)
THETA1=theta1(i);
for j= 1:length(theta2)
THETA2= theta2(j);
x=0;
y=0;
x1= l1*cosd(THETA1);
y1= l1*sind(THETA1);
x2=x1 + l2*cosd(THETA2);
y2=y1 + l2*sind(THETA2);
plot([x x1],[y y1],[x1 x2],[y1 y2],'linewidth',3)
axis([-0.1 1.5 0 1.5])
pause(0.8)
M(ct)= getframe(gcf);
ct=ct+1;

end
end

movie(M)
videofile= videowriter('forward_arm.avi','uncompressed AVI'); !line 29
open(videofile)
writevedio(videofile,M)
close(videofile)

Error

1) error were seen while executing the code in line number 29