Error while evaluating UIControl Callback.

Question

Hi Professors and Fellow users of MATLAB, I recently started using MATLAB ( for this subject) . I am having this error while executing the GUI file. Can someone please help me in solving this error. 
Thankyou.
Best Regards. 
Code: 

% UIWAIT makes CourseworkGui wait for user response (see UIRESUME)
% uiwait(handles.figure1);


% --- Outputs from this function are returned to the command line.
function varargout = CourseworkGui_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 pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
[filename, pathname] = uigetfile('*.*');    % Open a file browser

if filename == 0        % If the user didn't choose an image
    disp("Please, select an image.");
else
    handles.image_name = filename;  % Put the file name to handles
    handles.image_path = pathname;  % Put the file path to handles
    handles.image = imread(handles.image_name);     % Read the image
    imshow(handles.image, 'parent', handles.axes1)  % Display the image on the axes1
    guidata(hObject, handles);      % Save the handles info.
end


% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
tempImg = handles.image;
[x, y, z] = size(tempImg);      % Get a dimension of the image.

% If the image is colour, the image will be converted to grayscale image
if z == 3
    handles.image = rgb2gray(tempImg);  % RGB colour to grayscale
    guidata(hObject, handles);          % Save the handles info.
end

imshow(handles.image, 'parent', handles.axes1)  % Display the image on the axes1


% --- Executes on selection change in popupmenu1.
function popupmenu1_Callback(hObject, eventdata, handles)
val = get(hObject, 'Value');    % Get the selected value on the pop up menu
handles.dctType = val;          % Set the forward-DCT type
guidata(hObject, handles);      % Save the handles info.

% --- Executes during object creation, after setting all properties.
function popupmenu1_CreateFcn(hObject, eventdata, handles)
% Hint: popupmenu controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end


% --- Executes on button press in pushbutton3.
function pushbutton3_Callback(hObject, eventdata, handles)
% Jpeg Compresstion [flattened Image] = JpegCompression(ImageName, Compresstion rate, DCT type, I-DCT type)
newImg = py.myJpeg.JpegCompression(handles.image_name, handles.compression_rate, handles.dctType, handles.idctType);
% reshape the flattened image to 2D or 3D image
[x, y, z] = size(handles.image);      % Get a dimension of the image.
newImg = reshape(cellfun(@uint8, cell(newImg)), x, y, z);
imshow(newImg, 'parent', handles.axes2)     % Display the image on the axes2

handles.newImage = newImg;  % Put the JPEG image to handles

% Display count to know the process finished
handles.count = handles.count + 1;
str = sprintf("Test-%d", handles.count);
set(handles.edit3, 'String', str);

guidata(hObject, handles);      % Save the handles info.


% --- Executes on button press in pushbutton4.
function pushbutton4_Callback(hObject, eventdata, handles)
image = handles.newImage;

if image == 0   % If there is no JPEG image data
    disp("There is no image data.");
else
    % Open the browser to get the file name and the path the user selected
    [filename, pathname] = uiputfile('.jpeg');
    % Check the file name whether the user puts the file name or not
    if filename ~= 0
        filepath = strcat(pathname, filename);  % Make whole file path with the file name
        imwrite(image, filepath);               % Save the image
    end
end


% --- Executes during object creation, after setting all properties.
function axes1_CreateFcn(hObject, eventdata, handles)
handles.axes1 = gca;    % Get the handle of axes1
set(handles.axes1, 'XColor','none','YColor','none');    % Set the axes1 properties
guidata(hObject, handles);      % Save the handles info.

% --- Executes during object creation, after setting all properties.
function axes2_CreateFcn(hObject, eventdata, handles)
handles.axes2 = gca;    % Get the handle of axes2
set(handles.axes2, 'XColor','none','YColor','none');    % Set the axes2 properties
guidata(hObject, handles);      % Save the handles info.



function edit1_Callback(hObject, eventdata, handles)
filename = get(hObject, 'String');  % Get the selected value on the pop up menu
handles.newImage_name = filename;   % Set the new image name
guidata(hObject, handles);          % Save the handles info.

% Hints: get(hObject,'String') returns contents of edit1 as text
%        str2double(get(hObject,'String')) returns contents of edit1 as a double


% --- Executes during object creation, after setting all properties.
function edit1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end


% --- Executes on button press in pushbutton5.
function pushbutton5_Callback(hObject, eventdata, handles)
image = handles.newImage;
imagepath = handles.image_path;
imagename = handles.newImage_name;
imageformat = handles.newImage_format;

if image == 0   % Check the image array
    disp("There is no image data.");
else
    if isempty(imagename) == 1  % Check if the user put the file name or not
        disp("Please, enter the file name.")
    else
        % Make file name with the JPEG compression information
        % (image path + image name + compression rate + DCT type + IDCT type + file format)
        filename = sprintf('%s%s_K%.0f_D%d_ID%d.%s', imagepath, imagename, handles.compression_rate, handles.dctType, handles.idctType, imageformat);
        imwrite(image, filename);
    end
end

% --- Executes on button press in radiobutton1.
function radiobutton1_Callback(hObject, eventdata, handles)
% User selected JPG image format
if (get(handles.radiobutton1, 'Value'))     % Get the radio button handle and set the others off
    set(handles.radiobutton2, 'Value', 0)
    set(handles.radiobutton3, 'Value', 0)
    handles.newImage_format = "jpg";        % Set the image format JPG
    guidata(hObject, handles);              % Save the handles info.
end

% Hint: get(hObject,'Value') returns toggle state of radiobutton1


% --- Executes on button press in radiobutton2.
function radiobutton2_Callback(hObject, eventdata, handles)
% hObject    handle to radiobutton2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% User selected BMP image format
if (get(handles.radiobutton2, 'Value'))     % Get the radio button handle and set the others off
    set(handles.radiobutton1, 'Value', 0)
    set(handles.radiobutton3, 'Value', 0)
    handles.newImage_format = "bmp";        % Set the image format BMP
    guidata(hObject, handles);              % Save the handles info.
end

% Hint: get(hObject,'Value') returns toggle state of radiobutton2


% --- Executes on button press in radiobutton3.
function radiobutton3_Callback(hObject, eventdata, handles)
% hObject    handle to radiobutton3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% User selected JPEG image format
if (get(handles.radiobutton3, 'Value'))     % Get the radio button handle and set the others off
    set(handles.radiobutton1, 'Value', 0)
    set(handles.radiobutton2, 'Value', 0)
    handles.newImage_format = "jpeg";       % Set the image format JPEG
    guidata(hObject, handles);              % Save the handles info.
end

% Hint: get(hObject,'Value') returns toggle state of radiobutton3


% --- Executes on button press in pushbutton6.
function pushbutton6_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton6 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

figure('Name','Quantization Table','NumberTitle','off')
image(handles.quantization_table);


% --- Executes on slider movement.
function slider1_Callback(hObject, eventdata, handles)
% hObject    handle to slider1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

val = get(hObject, 'Value');    % Get the selected value on the pop up menu
handles.compression_rate = val; % Set the compression rate
set(handles.edit2, 'String', sprintf('%.2f', val));     % Display compression rate on the edit box
guidata(hObject, handles);      % Save the handles info.


% Hints: get(hObject,'Value') returns position of slider
%        get(hObject,'Min') and get(hObject,'Max') to determine range of slider


% --- Executes during object creation, after setting all properties.
function slider1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to slider1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: slider controls usually have a light gray background.
if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor',[.9 .9 .9]);
end



function edit2_Callback(hObject, eventdata, handles)
% hObject    handle to edit2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of edit2 as text
%        str2double(get(hObject,'String')) returns contents of edit2 as a double

str = get(handles.edit2, 'String');     % Get the compression rate
val = str2double(str);                  % Convert the string type to double type
if val >= 0.0 && val <= 100.0           % Check if the compression rate exceed the limit or not
    handles.compresstion_rate = val;    % Set the compression rate
    guidata(hObject, handles);          % Save the handles info.
    set(handles.slider1, 'Value', val); % Move the slider bar on proper position
else
    disp("Error : invalid value.");
end
% --- Executes during object creation, after setting all properties.

function edit2_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end


% --- Executes on selection change in popupmenu3.
function popupmenu3_Callback(hObject, eventdata, handles)
% hObject    handle to popupmenu3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

val = get(hObject, 'Value');    % Get the selected value on the pop up menu
handles.idctType = val;         % Set the inverse-DCT type
guidata(hObject, handles);      % Save the handles info.

% Hints: contents = cellstr(get(hObject,'String')) returns popupmenu3 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from popupmenu3


% --- Executes during object creation, after setting all properties.
function popupmenu3_CreateFcn(hObject, eventdata, handles)
% hObject    handle to popupmenu3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: popupmenu controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end



function edit3_Callback(hObject, eventdata, handles)
% hObject    handle to edit3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of edit3 as text
%        str2double(get(hObject,'String')) returns contents of edit3 as a double


% --- Executes during object creation, after setting all properties.
function edit3_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end


Error: 
Unable to resolve the name py.myJpeg.JpegCompression.

Error in CourseworkGui>pushbutton3_Callback (line 144)
newImg = py.myJpeg.JpegCompression(handles.image_name, handles.compression_rate, handles.dctType,
handles.idctType);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in CourseworkGui (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)CourseworkGui('pushbutton3_Callback',hObject,eventdata,guidata(hObject)) 
Error while evaluating UIControl Callback.

Error while evaluating UIControl Callback.

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