What does explanation sign mean on 7D

Notice on my camera it has a explanation mark on the right bottom side on the screen. and i have notice that it wont focus on the subject? What do i need to do to fix it?

HPL wrote:
Addittional info: I went to the 7D MkII instruction CD and indeed, there is a 500+ page instruction manual and the information about the " ! " warning sign is on page 441. It would be nice if the printed manual was a bit more comprehensive, but we should probably just be glad that there is a printed manual as many cameras no longer include them.
HPL
Well, this is the first mention of the Mark II; the OP's question appeared to refer to to the Mark I. The 7D (Mk 1) manual posted on the Canon site is identical to the one delivered with the camera; a later version of about the same size is also available. Apparently the Mk II manual is much larger.
I think the primary value of the printed manuals supplied by Canon is that they're small enough to carry around in one's camera bag. I'm not sure I'd want to carry a manual around if it were 500 pages long. So if for the 7D2, Canon is providing an abbreviated manual to carry around and the full one on-line to be printed and stored in a letter-size binder, that seems sensible to me.
Bob
Boston, Massachusetts USA

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