group programming

hii…

i am working on my game on window laptop,i have some difficulties in group programming,whenever i try to insert my background image in one of the group i have created…an error occured…something like

ATTEMPT TO INDEX LOCAL ‘BACKGROUND’(A FUNCTION VALUE).

here is my code

 --set display group

local  backGroup=display.newGroup;

local  mainGroup=display.newGroup;

local  uiGroup=display.newGroup;

–loading the background

local background=display.newImageRect(backGroup,“a.png”,1024,768);

background.x=display.contentCenterX

background.y=display.contentCenterY

Your display group code should be:

[lua]

local  backGroup=display.newGroup()

[/lua]

thanks

Your display group code should be:

[lua]

local  backGroup=display.newGroup()

[/lua]

thanks