Unrecognized function or variable 'wavread'.

How I sould solve this issue?

Unrecognized function or variable 'wavread'.

Error in GuiMain

Error in gui_mainfcn (line 95)

feval(varargin{:});

Error in GuiMain

Error in

matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)GuiMain('pushbutton1_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating UIControl Callback.