How to fix "Too many input arguments" error ?

I still can't get it what's wrong with my code, I've been searching about how to fix "too many input arguments error" but I still can't solve my problem.

here is my code :

function popupmenu2_Callback(source, eventdata)

str = get(source,'String');

switch str;

case '10'

C_Q = 10;

case '20'

C_Q = 20;

case '30'

C_Q = 30;

case '40'

C_Q = 40;

case '50'

C_Q = 50;

case '60'

C_Q = 60;

case '70'

C_Q = 70;

case '80'

C_Q = 80;

case '90'

C_Q = 90;

case '100'

 C_Q = 100;

end

display(C_Q);

end

Thank you very much

[Image Analyst]

http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

Answer 1

[Image Analyst]

Somehow you lost the handles input argument, which you need. The function should look like this:

function popupmenu2_Callback(source, eventdata, handles)
  try
    str = get(handles.popupmenu2,'String');
    if ~isempty(str)
      C_Q = str2double(str);
    else
      C_Q = -1; % or some value to indicate an empty field.
    end
  catch ME
    errorMessage = sprintf('Error in function %s() at line %d.\n\nError Message:\n%s', ...
  ME.stack(1).name, ME.stack(1).line, ME.message);
    fprintf(1, '%s\n', errorMessage);
    uiwait(warndlg(errorMessage));
end