Sidebars are no longer working

Question

I am trying to figure out why my sidebar is no longer working. I tried reinstalling my theme, disabling all of my plugins, and uploading a fresh version of widgets.php, with no luck.

I am using the Photogram theme, but the problem doesn't go away if I change to a different theme.

Here is what I see when I go to my widgets page:

Answer 1

uploading a fresh version of widgets.php

which widgets.php?

I guess you updated wp-admin/includes/widgets.php?

you actually need to update wp-includes/widgets.php where dynamic_sidebar function defined in.