Why does my Canon EOS 40D camera display error-99?

Why does my Canon EOS 40D camera display error-99? Why my 40 d dslr camera showing error-99?
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Total answers/comments: 2

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Guest [Entry]

"Take a look at this from Canon's Forum: Error 99

Here's another link from a camera repair company: Canon EOS Error 99"

Guest [Entry]

"Err 99:

Problem- Various reasons blocking the functioning of the camera.

DIY- Try to turn off the camera and restart it. If that doesn’t work clean the lens and camera body contact points."