Problem Deactivating Hummingbird Plugin

Hi guys! I have installed Hummingbird in my pannel, however I can not deactivate it. I can access to some part of the plugin settings, but every time I try to deactivate it I get this error “There has been a critical error on this website. Please check your site admin email inbox for instructions.”

Notice that I have also installed WP Optmize (which I think it might have some conflicts there), however, I can not deactivate any of the plugins installed now.

Any suggestions, I would appreciate a lot.

Thanks.