Huh. What is wrong with this object?

I started to model a pair of pants. However, when I decided to unwrap it before I continued with the back, I ended up with a really weird issue.

If I look at the transforms, I have this unexplained transform showing - blender transform -1.#IND

Plus I can’t unwrap it correctly.

Here’s what i did. I just started with a plane. Converted to one vertex. Outlined the object (pants) and did some grid fills.

How can I fix it?

Tried removing doubles. Tried selecting vertices and invert selection delete and everything goes?

Using 2.79 Blender.

File:
pants.blend (519 KB)

Well started over again and everything is OK now. Don’t know why this happened, but if anyone does know, I would appreciate also knowing so I don’t do it again.