"Sprite outline generation failed" iOS.

I just updated to unity 4.5 and started getting an error in my logs when I run my app on a device.

“Sprite outline generation failed - could not read texture pixel data. Did you forget to make the texture readable?”

I’ve broken this message down as many ways as I can but there’s no mention of it on google so I’m thinking it must be a new issue.

This happens when I try to add a PolygonCollider2D to an object at runtime. The collider works perfectly anyways but I’d really like to make this message go away.

Mark the texture type as advanced, enable read/write.