In this video, you will learn what to do when Automatic Weights doesn't work. In other words, how to solve the error "Bone Heat Weighting: failed to find a solution for one or more bones". This is an extremely common problem when trying to bind/skin a complex mesh to an armature.
The complexity of the armature is not that important but a complex character with many overlapping props etc. is very likely to cause this problem.
In this video, I will show the most common techniques for solving the issue. I will also try to help you understand how and why it happens.