If you’re seeing this message when trying to view MAMP, chances are you have just been amending a WordPress on your localhost and have altered the url’s ready for upload to a live server? Sound about right?
Same thing happened to me and I found this blog post that detailed the solution:
Basically, browse to the root of your hard drive and delete the .htaccess file (it should show today’s date but if you’re super cautious renaming the file will work too).
However, if you can’t see this file in the root, there’s a chance your OSX isn’t showing the system files. To see system files fire up Terminal (Appications > Utilties > Terminal.app) and enter the following:
defaults write com.apple.finder AppleShowAllFiles TRUE killall Finder
When you’ve deleted the file, if you want to re-hide the system files enter the following in Terminal and hit return:
defaults write com.apple.finder AppleShowAllFiles FALSE killall Finder
Good old MAMP should fire up properly again now. Phew, that was a relief…