Why error to GUI?

function varargout = SmarthomeIsyarat(varargin)
% SMARTHOMEISYARAT M-loadvideo for SmarthomeIsyarat.fig
%      SMARTHOMEISYARAT, by itself, creates a new SMARTHOMEISYARAT or raises the existing
%      singleton*.
%
%      H = SMARTHOMEISYARAT returns the handle to a new SMARTHOMEISYARAT or the handle to
%      the existing singleton*.
%
%      SMARTHOMEISYARAT('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in SMARTHOMEISYARAT.M with the given input arguments.
%
%      SMARTHOMEISYARAT('Property','Value',...) creates a new SMARTHOMEISYARAT or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before SmarthomeIsyarat_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to SmarthomeIsyarat_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 SmarthomeIsyarat

% Last Modified by GUIDE v2.5 03-Mar-2016 12:41:14

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @SmarthomeIsyarat_OpeningFcn, ...
                   'gui_OutputFcn',  @SmarthomeIsyarat_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 SmarthomeIsyarat is made visible.
function SmarthomeIsyarat_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 SmarthomeIsyarat (see VARARGIN)

% Choose default command line output for SmarthomeIsyarat
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes SmarthomeIsyarat wait for user response (see UIRESUME)
% uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line.
function varargout = SmarthomeIsyarat_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 during object creation, after setting all properties.
function figure1_CreateFcn(hObject, eventdata, handles)
hback = axes('units','normalized','position',[0 0 1 1]);
uistack(hback,'bottom');
[back map]=imread('backgroundFilkom.png');
image(back)
colormap(map)
set(hback,'handlevisibility','off','visible','off')

% --- Executes on button press in loadvideo.
function loadvideo_Callback(hObject, eventdata, handles)
proyek=guidata(gcbo);
[namafile,direktori]=uigetfile({'*.avi';'*.mov';'*.mp4';'*.mpeg'},'Buka Gambar')
if isequal(namafile,0)
return;
end
eval(['cd ''' direktori ''';']);
I=imread(namafile);
set(proyek.figure1,'CurrentAxes',proyek.axes1);
set(imshow(I));
set(proyek.figure1,'Userdata',I);
set(proyek.axes1,'Userdata',I);

Why error???

Error in ==> SmarthomeIsyarat>loadvideo_Callback at 92
I=imread(namafile);

Error in ==> gui_mainfcn at 96
        feval(varargin{:});

Error in ==> SmarthomeIsyarat at 42
    gui_mainfcn(gui_State, varargin{:});

Error in ==> @(hObject,eventdata)SmarthomeIsyarat('loadvideo_Callback',hObject,eventdata,guidata(hObject))

??? Error while evaluating uicontrol Callback

Answer 1

[Walter Roberson]

Do not use eval(), especially not for this purpose.

[namafile, direktori] = uigetfile({'*.avi';'*.mov';'*.mp4';'*.mpeg'},'Buka Gambar')
if isequal(namafile,0)
  return;
end
filename = fullfile(direktori, namafile);
if ~exist(filename, 'file')
   warndlg( sprintf('Failed to find file "%s"', filename) ); %odd !
  return
end
I = imread(filename);

[Marquel Dwi Putranto]

Thank you Mr walter