Brace indexing is not supported for variables of this type

Hi All,
I am just starting the toolbox and while trying .make_grid’ it shows the error as below, I really dont understand…can you help me.


Unable to perform assignment because brace indexing is not supported for variables of this type.

Error in create_grid (line 61)
nw{‘xl’} = ncdouble(‘one’);

Error in easy>pushbutton4_Callback (line 345)
create_grid(nx+1,ny+1,grdname,CROCO_title) % create grid file

Error in gui_mainfcn (line 95)
feval(varargin{:});

Error in easy (line 26)
gui_mainfcn(gui_State, varargin{:});

Error in matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)easy(‘pushbutton4_Callback’,hObject,eventdata,guidata(hObject))

Error using make_grid
Error while evaluating UIControl Callback.