Infinite loading using Site Builder (editing any Widgets)

Hi there. I’ve been building up a WordPress site locally and used a few Site Origin plugins. Recently, We uploaded the website and DB to a live server, and now I’m having problems regarding the editing of the widgets.

Whenerver I try to edit a Widget, i get the loading animation but it won’t load at all.

I’ve already tried cleaning cache and deactivating all other plugins, but I still get the same error.

Ironically, on my local server it still works flawlessly, but not on live.

For more information, I have the exact same bug when I try to search for a new plugin from the plugins menu in the WordPress admin. The loading wheel will keep rolling forever.

Would appreciate any help.