Nature tree ao shader, how to change it so Beast will accept it?

I need some help with the tree shader and beast, since I noticed the wont bake.

I have searched around and found some answers saying than AO shaders will not bake, and since the nature shader being applied on the unity created tree's supports AO, I figured the problem is found there. However, I have not been able to find a way to change that or work around this problem.

Is there anyone that can help me out with this? What is the best way to get a lightmap for trees I created with the Unity tree system?

Thanks in advance