急求matlab gui设计中要给access数据库添加字符串，出错

按钮的函数：
function pushbutton1_Callback(hObject, eventdata, handles)
coona=database('jiance','','');
curs=exec(coona,'select * from disease');
curs=fetch(curs);
a=get(handles.popupmenu1,'String');
b=get(handles.popupmenu2,'String');
c=get(handles.popupmenu3,'String');
d=get(handles.edit1,'String');
e=get(handles.popupmenu4,'String');
f=get(handles.edit2,'String');
insert(coona,'disease',{'病害诊断库','构件','病害类型','病害描述','病害程度','病因分析'},{a,b,c,d,e,f});
commit(coona);
close(curs);
close(coona);
错误显示：
??? Error using ==> horzcat
The following error occurred converting from char to cell:
Error using ==> cell
Conversion to cell from char is not possible.

Error in ==> database.insert at 141
tmpstr = ['''' tmp ''''];

Error in ==> disease_imput>pushbutton1_Callback at 266
insert(coona,'disease',{'病害诊断库','构件','病害类型','病害描述','病害程度','病因分析'},{a,b,c,d,e,f});

Error in ==> gui_mainfcn at 75
feval(varargin{:});

Error in ==> disease_imput at 44
gui_mainfcn(gui_State, varargin{:});

??? Error while evaluating uicontrol Callback.

Conversion to cell from char is not possible.
从字符转换成单元是不可能的

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