Apache server won\'t start when in MAMP. Here are the error logs:
[Wed Aug 01 21:07:34 2012] [notice] Digest: generating secret for digest authentication ...
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If your existing MAMP PRO suddenly won't start Apache anymore, then it might be an error in vhosts settings which is not visible.
There is often no indication in apache_error.log - it just comes up with the message.
Apache wasn't able to start. Please check log for more information.
In my case it was a wrong path in Customized virtual host settings such as
Include /path/to/project/rewrite.conf
Vhost config is saved in ~/Library/Application Support/appsolute/MAMP PRO/httpd.conf so you can check the settings there.