I'm having an error on one of our projects. When our character generates a mecanim controller on my mac running unity 2017, it imports into the scene as a "SkeletonAnimator" and works perfectly.

When it imports onto our developers machine running unity 2018, generating a mecanim controller and then importing it into the scene replaces the "SkeletonAnimator" option with "SkeletonMecanim". This seems to be bugged though, as the skins are not selectable (but can be typed in manually) and when you click run, a script error says "The associated script cannot be loaded, please fix compiling errors."

Is this a known bug? I cannot find anything about a script change from Skeleton Animator to Skeleton Mechanim, and Skeleton Animator is still referenced when creating a controller. Is there any way I can force the character to import into the scene using SkeletonAnimator instead?