What causes the "Odd Tag in Cleanup" error?

I’m using Unity 5.3.1 and my app will deploy to my test phone (using VS 2015 to deploy to a windows phone running WP8.1) but once after the Unity splash screen shows the app crashes when my first scene is loaded, but only if it has an animation in it.

Then I see the ‘Odd Tag in CleanUp’ in my Output window in VS…

Anyone with any idea as to why this might be happening?

So I am having the same issue after having to replace my old mobo and CPU (Gigabyte F2A68M-H and an A6-7400K). I started a scene from scratch and the error came in when I added Speedtrees to my scene.