Deactivating plugin invokes warnings from wp-config

I deactivated WP Cerber on my site (multisite) and got the following errors at the top of my admin section: https://drive.google.com/file/d/1q0KZdQaEyJiZtE7A9vVs1hO-p7M9rDGC/view?usp=sharing

How can I resolve this?

Thanks,