Logic Pro may show an "Incompatible Audio Units found." error if you do not have a valid license for a Synchro Arts plugin:
Pro
To resolve this, make sure to activate your iLok license(s) as necessary.
Once you have valid iLok license(s) in place, you may also need to reset your plugins that failed validation in Logic Pro's Plug-In Manager, by clicking on them to select them, then clicking the Reset & Rescan Selection button, as shown in this image for VocAlign Project 5:
