System Preference, Security & Privacy, Accessibility - Not Working/Empty

I have the same problem listed here System Preference, Security & Privacy, Accessibility - Not Working/Empty but the solution provided is not working.

I've just update to Mojave, after the upgrade the System Preference, Security & Privacy, Accessibility access list went empty. I can't use +/- either, the + command does nothing.

The list should display several apps that I use like Dropbox and BetterTouch Tool.

I tried to remove the file

/Library/Preferences/com.apple.security-common.plist

But this file isn't present in my system, I only have:

$ sudo find /Library/Preferences | grep -i security

/Library/Preferences/com.apple.security.systemidentities.plist

/Library/Preferences/com.apple.security.appsandbox.plist

$ sudo find ~/Library/Preferences -maxdepth 1 | grep -i security

/Users/***/Library/Preferences/com.apple.security.KCN.plist

/Users/***/Library/Preferences/com.apple.security.keychainsyncingoveridsproxy.un handledMessages.plist

/Users/***/Library/Preferences/com.keepersecurity.passwordmanager.plist

/Users/***/Library/Preferences/com.keepersecurity.passwordmanager.helper.plist

/Users/***/Library/Preferences/com.keepersecurity.agent.plist

/Users/***/Library/Preferences/com.apple.security.cloudkeychainproxy3.keysToRegi ster.plist