MATLAB: I am using MATLAB R2016b..I am working with medical MRI 3D images..i want to read and visualize them…but it generates error

Error using fopen

First input must be a file name or a file identifier.

Error in mha_read_volume (line 28)

fid=fopen(info.Filename','rb','ieee-le');

Error in ReadData3D>loaddata (line 379)

data.volume=feval(fhandle,data.info);

Error in ReadData3D>pushbutton_load_Callback (line 365)

loaddata();

Error in gui_mainfcn (line 95)

feval(varargin{:});

Error in ReadData3D (line 70)

gui_mainfcn(gui_State, varargin{:});

Error in

matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)ReadData3D('pushbutton_load_Callback',hObject,eventdata,guidata(hObject))

Error using uiwait (line 81)

Error while evaluating UIControl Callback