bind() to 0.0.0.0:80 failed (98: Address already in use)

I have installed nginx server on ubuntu 11.04(Natty Narwhal). After installation while I start the nginx server, I got the error:

bind() to 0.0.0.0:80 failed (98: Address already in use)

I found the apache server is running on the same port on 80. So, I stop the Apache server and The error gone.
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