How to fix the" Error using handle.handle/get Invalid or deleted object"?

I Wrote this code to program but got this error. Any tips to fix this please? thank you.

%% Main Code
% Initialise the graph
Rect_ne_1 = plot(NaN,NaN, '-b');%Open empty graph. NaN - Not a number.
axis([-10 10 -10 10]); grid on;
title('\fontname{Georgia}\fontsize{12}\color{black} \Theta = ');

Vector_new_for_Rectangle = plot(NaN,NaN, '-r');
axis([-10 10 -10 10]); grid on;
%main
a1 = 2;
a2 = 6;
a3 = 4;
for thetad =1:90;
    R = [cosd(thetad) -sind(thetad); sind(thetad) cosd(thetad)];
    x2 = R*[a1;a1];
    x3 = R*[a2;a2];
    y2 = R*[a1;a3];
    y3 = R*[a3;a1];
    x1 = [a1; a1; a2; a2; a1];
    y1 = [a1; a3; a3; a1; a1];
    v1 = [get(Rect_ne_1, 'XData'), x1];
    v2= [get(Rect_ne_1, 'YData'), y1];
    set(Rect_ne_1, 'XData', v1, 'YData', v2);
    drawnow; 
    
    v3 = [get(Vector_new_for_Rectanle, 'XData'), [x2;x3]];
    v4= [get(Vector_new_for_Rectanle, 'YData'), [y2;y3]];
    set(Vector_new_for_Rectanle, 'XData', v3, 'YData', v4);
   drawnow;
   pause(0.1);
end
    
  

[Mara]

Hello, depending on where the error occurs, MATLAB can either not find Rect_ne_1 or Vector_new_for_Rectanle...is there maybe a typo and it is called Rectangle?