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Invalid object handle error

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I have the following code which is a graphic rendering of the movement of a satellite around the Earth.
function ex
global state;
fh = figure('Menu','none','Toolbar','none','Units','characters');
hPanAni = uipanel('parent',fh,'Units','characters','Position',...
[22.6 10.4 53 23],'title','Controls','FontSize',11,...
'FontAngle','italic','FontWeight','bold');
hIniAni = uicontrol(hPanAni,'Style','pushbutton','Units','normalized',...
'Position',[0.14 0.75 0.5 0.12],'String','Spin',...
'FontSize',10,'Callback',@hIniAniCallback);
hFinAni = uicontrol(hPanAni,'Style','pushbutton','Units','normalized',...
'Position',[0.14 0.5 0.5 0.12],'String','Stop',...
'FontSize',10,'Callback',@hFinAniCallback);
hResetAni = uicontrol(hPanAni,'Style','pushbutton','Units','normalized',...
'Position',[0.14 0.25 0.5 0.12],'String','Reset',...
'FontSize',10,'Callback',@hResetAniCallback);
hPantSim = uipanel('Parent',fh,'Units','characters',...
'Position',[107.87 8 157.447 42],'BorderType','none','title',...
'Screen','FontSize',11,'FontAngle','italic',...
'FontWeight','bold');
hPantSimInt = uipanel('Parent',hPantSim,'Units','normalized','Position',...
[0 0 1 1],'BorderType','line','BackgroundColor','black');
ah4 = axes('Parent',hPantSimInt,'Units','normalized','Position',...
[0 0 1 1],'Color','none','Visible','off','DataAspectRatio',...
[1 1 1],'NextPlot','add');
rotate3d(ah4);
hgrot = hgtransform('Parent',ah4);
T1 = 0:pi/100:2*pi;
Y = zeros(numel(T1),3);
Y(:,1) = 7000*cos(T1);
Y(:,2) = 7000*sin(T1);
xmin = min(Y(:,1));
ymin = min(Y(:,2));
zmin = min(Y(:,3));
xmax = max(Y(:,1));
ymax = max(Y(:,2));
zmax = max(Y(:,3));
Resf = 6378;
xmin2 = min(xmin,-Resf);
xmax2 = max(xmax,Resf);
ymin2 = min(ymin,-Resf);
ymax2 = max(ymax,Resf);
zmin2 = min(zmin,-Resf);
zmax2 = max(zmax,Resf);
set(ah4,'XLim',[xmin2 xmax2],'YLim',[ymin2 ymax2],'ZLim',[zmin2 zmax2]);
maptext = imread('tierra.jpg');
[X_im, map] = rgb2ind(maptext,128);
[x_esf,y_esf,z_esf] = sphere(50);
x_esf = Resf*x_esf;
y_esf = Resf*y_esf;
z_esf = Resf*z_esf;
props.FaceColor= 'texture';
props.EdgeColor = 'none';
props.Parent = hgrot;
props.Cdata = flipud(X_im); % it is necesary to do this for getting the
% appropiate image on the sphere
surface(x_esf,y_esf,z_esf,props);
colormap(map);
axis equal vis3d;
view(3);
az = 0;
Fin = numel(T1);
k = 2;
ind_ini = 0;
state = 0;
handles.tray = zeros(1,Fin);
handles.psat = line('parent',ah4,'XData',Y(1,1), 'YData',Y(1,2),...
'ZData',Y(1,3),'Marker','o', 'MarkerSize',10,'MarkerFaceColor','b');
function hIniAniCallback(hObject,evt)
if (ind_ini == 1)
return;
end
ind_ini = 1;
state = 0;
while (k<Fin)
az = az + 0.01745329252;
set(hgrot,'Matrix',makehgtform('zrotate',az));
handles.tray(k) = line([Y(k-1,1) Y(k,1)],[Y(k-1,2) Y(k,2)],...
[Y(k-1,3) Y(k,3)],...
'Color','red','LineWidth',3);
set(handles.psat,'XData',Y(k,1),'YData',Y(k,2),'ZData',Y(k,3));
pause(0.02);
k = k + 1,
if (state == 1)
state = 0;
break;
end
end
end
function hFinAniCallback(hObject,evt)
ind_ini = 0;
state = 1;
end
function hResetAniCallback(hObject,evt)
set([handles.tray,handles.psat],'Visible','off');
k = 2;
ind_ini = 0;
state = 1;
az = 0;
set(hgrot,'Matrix',makehgtform('zrotate',az));
handles.psat = line('parent',ah4,'XData',Y(1,1), 'YData',Y(1,2),...
'ZData',Y(1,3),'Marker','o', 'MarkerSize',10,'MarkerFaceColor','b');
end
end
However, when I copy it to my main program I get the following error message:
??? Error using ==> surface Invalid object handle
Error in ==> simorbiv8v3>hIniPropCallback at 1911 surface(x_esf,y_esf,z_esf,props);
??? Error while evaluating uicontrol Callback
I do not understand what is happening.
  1 Comment
Walter Roberson
Walter Roberson on 25 Dec 2011
Is this question still active? I note that you just edited it, but I thought fixing the cla problem was the solution ?

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Accepted Answer

Walter Roberson
Walter Roberson on 23 Dec 2011
Command
dbstop if error
and then run the code. When it stops at that line, examine props.Parent and in particular check ishandle(props.Parent) . If it says that it is not a handle, chase further up to ah4 and make sure that it is still a handle, then up to hPantSimInt and then to hPantSim and then to fh
  4 Comments
Julián Francisco
Julián Francisco on 25 Dec 2011
@Walter Roberson: The code shown is a part of the code for the main program and it needs to be modified (the hgrot variable should be declared as global one). Now the problem is fixed (as seen in my answer). Thank you for your help.

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More Answers (1)

Julián Francisco
Julián Francisco on 24 Dec 2011
Finally, I have found that there was a cla command line, which was the guilty of the error, in the main program before the surface call.

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