1. Following plugins throw the same error (all BeTheme included):
- BeTheme Header Builder
- Layer Slider
- Slider Revolution
- WPBakery Page Builder
2. Also after deactivation for updating Layer Slider as described on your page, I can't reactivate the plugin by the "activate" button.
There is enough disc space on our webserver (60% of 20 GB free).
Please give me instructions on how to fix this.