I was trying to apply an ''Armature Deform'' with ''Automatic Envelop Weights'' to my MakeHuman model imported into Blender, but apparently there's a problem somewhere. Here's a screenshot of the model with the metarig visible.
When the error message popped up for the first time, I divided the rig into different parts (two arms, two legs, the head and the body) before parenting them together, in order to see if there was a part of the armature that was causing the issue. That's a bit of a desperate measure, as I know that if there's a problem it's at the model level.
I tried lots of things, like turning subsurf on before applying the armature deform, removing doubles, etc. Still, the model is supposed to be perfectly symmetrical, and so should be the armature (I rigged it with X-axis mirror turned on).
For once, I thought I'd not get that error with a MakeHuman ''perfect'' model, but yeah, damn it.
Thanks in advance, any advice or help would be quite appreciated!