I’m getting the following error: Fatal error: Uncaught Error: Call to undefined function oil_paint_regeneration() [closed]

You need to contact the plugin support forum for help with plugins; it’s not within the scope of support here.

But the error means that the function oil_paint_regeneration isn’t available at that time in the processing of the site. Could be that the plugin is not loading their functions at the proper time.

But, the plugin guys need to fix this.