Error: Unknown Cook Failure

So, this happened to me when I finished my Animation Blueprint, after I’m trying to build it, lot’s of errors come out, and packaging fails. And removing animations fixes it, but that’s not the solution which I need. I added log of last packaging.
Does anyone know about this?link text

Solved by myself, Animation Blueprint had empty “entry node” without anything too far in graph to see it, after deleting works just fine.