Quick rig feature creates a hole in my character's forehead.

[Anonymous]

Hey I've been trying to quick rig my character for a couple days now, but every time I click "auto-rig" in the "one-click" tab, or try skinning in the "step-by-step" tab, a hole of some sorts is created in my character's forehead, and it cannot be simply bridged shut. I'm not sure why this is happening, but any help would be greatly appreciated! I'll attach some screenshots of what it looks like. Thank you!