I don’t know how to read output log, that’s Unreal’s business but I’ve had same problem before. I remember that I did something stupid and there was a bug related to animations.
I’m not really sure anymore but I think mine crashed due to fact that my parent called a function directly that was located in child. Of course that doesn’t work because a parent does not see it’s child, it’s child only sees parent.
So make sure you did not do something like that 