Widgets missing under customize

Widgets have gone missing when I click on customize. All it says is this…

“Your theme has 6 widget areas, but this particular page doesn’t display them.

You can navigate to other pages on your site while using the Customizer to view and edit the widgets displayed on those pages.”

it worked before. Not sure what happened. Please help.

HI there

Make sure all your required plugins ply the theme is installed and activated, but if this is not the case please provide admin details and i will check your problem