Error Message: Plug-in for device 'V-Control24' is missing.

Try trashing the Logic Controller Prefs.. Hold down the Option Modifier while clicking the "Go" tab in finder. This will reveal the User Library.

Once opened, scroll to /Library/Preferences/com.apple.logic.pro.cs and delete this preference file, then open logic.

If that doesn't help, try trashing all the Logic preferences in this folder.

com.apple.logic10 and com.apple.logic.pro.cs

Here is the support article as well:

slatemediatechnology.zendesk.com/hc/en-us/articles/360036916354