Error using wavread on only a file?

So here is my code & problem:

ButtonA

   function pushbutton5_Callback(hObject, eventdata, handles)
   [fileName,filePath]=uigetfile({'.wav'},'File Selector');
   name = fullfile(filePath,fileName);
   handles.fileName=name;
   guidata(hObject,handles);

Button B

   function pushbutton8_Callback(hObject, eventdata, handles)
   File=handles.fileName;
   [data, Fs, nbits] = wavread(File);

The error : only errror if i input a processed file. other files are fine

??? Error using ==> wavread at 166 Invalid field name: ''.

Error in ==> attack>pushbutton8_Callback at 338 [data, Fs, nbits] = wavread(File);

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

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

Error in ==> @(hObject,eventdata)attack('pushbutton8_Callback',hObject,eventdata,guidata(hObject))

??? Error while evaluating uicontrol Callback

What is strange here is this code is work for all my file except 1, which is a file that i've been doing some process in it actually it is watermarking. So what i wanted to know is why is this happening ? what specification for a file can be read using wavread?

And 1 thing come on my mind that the only different that the error file than the other have was before the data header.. take a look at this pict, could it be the problem?

before i process .wav file (can be read)

after i process.wav file (can't be read)

%

Answer 1

[Jan]

You do not define the variable File at all in:

function pushbutton8_Callback(hObject, eventdata, handles)
[data, Fs, nbits] = wavread(File);

Therefore I'm surprised about the error message. Actually File should be undefined and not the empty string.

This callback has to obtain the file name from where it is stored:

function pushbutton8_Callback(hObject, eventdata, handles)
handles = guidata(hObject);  % Is this required to get the newest version?
[data, Fs, nbits] = wavread(handles.fileName);

[I Made]

i'm very sorry i write the code wrong.. i'm already edit it..

First time i use to write my code like you.. But same result it's not working for this 1 file.. Another file works just fine