MATLAB: Error while using a GUI

gui error

Hi MATLAB experts,
I've been getting these errors notifications when trying using a toolbox GUI (the m.file is attached):
>> MCMxxxVI_RGBExplorer
Undefined function or variable 'file'.
Error in MCMxxxVI_RGBExplorer>pushbutton1_Callback (line 116)
    [pathstr,name,ext]=fileparts(fullfile(pathname,file));
Error in gui_mainfcn (line 95)
        feval(varargin{:});
Error in MCMxxxVI_RGBExplorer (line 64)
    gui_mainfcn(gui_State, varargin{:});
Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)MCMxxxVI_RGBExplorer('pushbutton1_Callback',hObject,eventdata,guidata(hObject)) 
Error while evaluating UIControl Callback.
Would very appreciate any advice,
Tamir
EDIT: Tamir'S "Answer" moved here:
Hi Luna,
The files are attached,
these are the error notifications:
>> MCMxxxVI_RGBExplorer
Undefined function or variable 'file'.
Error in MCMxxxVI_RGBExplorer>pushbutton1_Callback (line 116)
    [pathstr,name,ext]=fileparts(fullfile(pathname,file));
Error in gui_mainfcn (line 95)
        feval(varargin{:});
Error in MCMxxxVI_RGBExplorer (line 64)
    gui_mainfcn(gui_State, varargin{:});
Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)MCMxxxVI_RGBExplorer('pushbutton1_Callback',hObject,eventdata,guidata(hObject)) 
Error while evaluating UIControl Callback.
Error using fileparts
Too many output arguments.
Error in MCMxxxVI_RGBExplorer>pushbutton2_Callback (line 130)
    [pathstr,name,~,~]=fileparts(fullfile(pathname,file2));
Error in gui_mainfcn (line 95)
        feval(varargin{:});
Error in MCMxxxVI_RGBExplorer (line 64)
    gui_mainfcn(gui_State, varargin{:});
Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)MCMxxxVI_RGBExplorer('pushbutton2_Callback',hObject,eventdata,guidata(hObject)) 
Error while evaluating UIControl Callback.
Error using fileparts
Too many output arguments.
Error in MCMxxxVI_RGBExplorer>pushbutton5_Callback (line 387)
[pathstr,name,ext,versn]=fileparts(get(handles.edit1,'String'));
Error in gui_mainfcn (line 95)
        feval(varargin{:});
Error in MCMxxxVI_RGBExplorer (line 64)
    gui_mainfcn(gui_State, varargin{:});
Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)MCMxxxVI_RGBExplorer('pushbutton5_Callback',hObject,eventdata,guidata(hObject)) 
Error while evaluating UIControl Callback.

Best Answer

Hi Tamir,
Just change line 116 as follows, definetely it will work: 
[pathstr,name,ext]=fileparts(fullfile(pathname,file1));
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