The editor section wont appear

When i click on the “Visual Page Builder” button it doesn’t show the Elements sections on pages while it is working fine on the post and custom post type. On the settings, i have enabled all the post types and pages but still it doesn’t appear. It was working fine but all of a sudden there is an issue. what could be the issue and fix ?

https://ww.wp.xz.cn/plugins/siteorigin-panels/

Update: Sorry for the above post. By the way i was using plugin “Page Builder” from Unyson.