我在设置动画接口时，在状态机中会报这个错：
[Linked anim layer node Idle is part of Animation Layer Graph ‘Idle’, linked layers cannot be nested.]在状态机最外层却不报错问题，我还以为是不能写在状态机中呢！
结果是和状态机的名字重复了！！！！，
算是个ue官方的bug，写在这里让大家少踩坑。
When I set up the animation interface, I reported this error in the state machine:
[Linked anim layer node Idle is part of Animation Layer Graph ‘Idle’, linked layers cannot be nested.]
I thought you couldn’t use the interface in the state machine！
The result is because it has the same name as the state machine ！！！！
It’s an official ue bug, and it’s written here so you don’t mess around.
