'Animation' does not contain a definition for 'Play'

Hi, I have error and I can't fix this error alone So I asked here.

I made animations in my project, and I saw that animation running well yesterday.

But when I open my project today morning, I found this error.

"Animation does not contain a definition for 'Play'"

I adjust my animation with codes, and In that codes, animation.Play() and animation.Stop() is red.

I can't understand this error because that is basic function of Animation In Unity.

I can't do anything about this error, Please help me.