Animation window error unity 5.1.0f3

Hello unity forums, this error is frighting.

We didn’t start getting this error until we updated to unity 5.1.0f3.

Please, advise.

can any one help?

Does anyone know this question? how come unity doesn’t answer?

Not to be mean, but do I have to spend $1500 dallors to get any help on this issue?

Running into the same issue here. Looks like there’s another thread about it: Animation/Animator Problems - Unity Engine - Unity Discussions