MATLAB的GUIDE编了个小程序能在.m文件里运行但是在.fig下面一运行就出错是为什么？错误如下

??? Attempt to reference field of non-structure array.
Error in ==> ex>pushbutton1_Callback at 124H = str2double(get(handles.edit1,'string'));
Error in ==> gui_mainfcn at 96 feval(varargin{:});
Error in ==> ex at 42 gui_mainfcn(gui_State, varargin{:});
Error in ==> @(hObject,eventdata)ex('pushbutton1_Callback',hObject,eventdata,guidata(hObject))
??? Error while evaluating uicontrol Callback