Matlab Attempt to reference field of non-structure array - matlab

Question

I have 3 figures
1- principle contain 2 buttons
2- figure to load one image and diplay it on an axe
3- figure to load two images and diplay it on axes
when i run the figure 3 or 2 all alone everything is fine and the images got displayed.
THE PROBLEM when i run the prgrm from principle.fig and open the 2nd figure or the 3rd an error popup
Attempt to reference field of non-structure array.
Error in untitled3>pere_Callback (line 91)
axes(handles.axes1);
my code
function varargout = untitled3(varargin)
% UNTITLED3 MATLAB code for untitled3.fig
% UNTITLED3, by itself, creates a new UNTITLED3 or raises the existing
% singleton*.
%
% H = UNTITLED3 returns the handle to a new UNTITLED3 or the handle to
% the existing singleton*.
%
% UNTITLED3('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in UNTITLED3.M with the given input arguments.
%
% UNTITLED3('Property','Value',...) creates a new UNTITLED3 or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before untitled3_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to untitled3_OpeningFcn via varargin.
%
% *See GUI Options on GUIDE's Tools menu. Choose "GUI allows only one
% instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES
% Edit the above text to modify the response to help untitled3
% Last Modified by GUIDE v2.5 01-May-2017 17:19:08
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', #untitled3_OpeningFcn, ...
'gui_OutputFcn', #untitled3_OutputFcn, ...
'gui_LayoutFcn', [] , ...
'gui_Callback', []);
if nargin && ischar(varargin{1})
gui_State.gui_Callback = str2func(varargin{1});
end
if nargout
[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT
% --- Executes just before untitled3 is made visible.
function untitled3_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject handle to figure
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% varargin command line arguments to untitled3 (see VARARGIN)
% Choose default command line output for untitled3
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes untitled3 wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = untitled3_OutputFcn(hObject, eventdata, handles)
% varargout cell array for returning output args (see VARARGOUT);
% hObject handle to figure
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Get default command line output from handles structure
varargout{1} = handles.output;
% --- Executes on button press in pere.
function pere_Callback(hObject, eventdata, handles)
% hObject handle to pere (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global im im2
[path,user_conce] = imgetfile();
if user_conce
sprintf('error');
return
end
im=imread(path);
im2 = im; %backup
im = im2double(im);
im = rgb2gray(im);
axes(handles.axes1);
imshow(im);
% --- Executes on button press in fils.
function fils_Callback(hObject, eventdata, handles)
% hObject handle to fils (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global im3 im4
[path,user_conce] = imgetfile();
if user_conce
sprintf('error');
return
end
im3=imread(path);
im4 = im3; %backup
im3 = im2double(im3);
im3 = rgb2gray(im3);
axes(handles.axes3);
imshow(im3);
% --- Executes on button press in tester.
function tester_Callback(hObject, eventdata, handles)
% hObject handle to tester (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)