could not access local image wordpress error?

my website was working very well and i was in maintenance mood and working at back end but before going to launch i installed smush.it and wp super cache plugin i run wp super cache and it was giving me a lot options to do so so i deactivated it thinking that will see it again then i went back to my home page but my site messed its giving error saying a popup
“could not access local image” i did also a restore of my previous old backup but its still on same kindly help.