Nsryjdtyk

Check if you changed the Document Root Location or Renamed it. At least this was my mistake.

MAMP > Preferences > Web Server > Document Root

I didn't get it working with port 8000 or the default 8888, but did get it working with port 80 per the suggestion here:
http://forums.macrumors.com/showthread.php?t=1744944

That didn't work after all, but it didn't error out. However I manually ran the following at the command line (because log file was empty):

sudo /Applications/MAMP/Library/bin/apachectl start

Only to find that after upgrading I was missing the mod_example.so

httpd: Syntax error on line 83 of /Applications/MAMP/conf/apache/httpd.conf: Cannot load /Applications/MAMP/Library/modules/mod_example.so into server: dlopen(/Applications/MAMP/Library/modules/mod_example.so, 10): image not found

Copied it from my old install and I was good to go.

Had the same problem, nothing in the logs. After trying the_dillio's suggestion:

sudo /Applications/MAMP/Library/bin/apachectl start

I got an error that pointed back to my vhosts file. It turns out I had an extra /VirtualHost tag. Removed it and it started working again.

Also be aware that if you by any chance deleted the folder that was set as Document Root the last time you were using MAMP, you will get this error. Simply open MAMP again, change Document Root to a location that does exist and start the servers.

I think I've found the solution.

It was the wrong port. I altered the .conf file in the Apache folder. I changed all instances of port 8888 to 8000. When I run MAMP now it all seems to work fine.

Thanks for your help

If you try to start the server from the terminal, likely that will tell you what is wrong e.g.

$ sudo /Applications/MAMP/bin/startApache.sh

Password:

(48)Address already in use: make_sock: could not bind to address [::]:8888
(48)Address already in use: make_sock: could not bind to address 0.0.0.0:8888

no listening sockets available, shutting down

Unable to open logs

In this case, I was inadvertently running a Blockstack browser out of 8888, so changing MAMP to 8887 allowed it to start. [Your mistake might be different.]

I received the same error but interestingly it was caused simply because I renamed the root folder and didn't realize it. Sounds like you have a different issue but for anyone else who gets this error message, make sure you haven't renamed the root!

I had this experience when upgrading to V4. It tried to used the files from my previous installation and it just never worked. The workaround was to RENAME the original MAMP installation to something different than "MAMP", install brand new version and then copy files you may need like VHOST configs and DATABASES. After all this it worked just fine.

My Apache server problem arose after I enabled SSL on my server and tried a stack overflow suggested Terminal command (eek). So if this is your problem, check your https-ssl.conf file (Applications -> Mamp -> conf -> apache -> extra). The Document Root under the Virtual Host settings had a different file path for htdocs than where it was actually located (easily overlooked on the fly). I changed this to "/Applications/MAMP/htdocs" and presto, problem solved. Perhaps also check Document Root in your https.conf file (Applications -> Mamp -> conf -> apache) to see if it has the correct file path to htdocs too.

Absolutely bizarre behavior for MAMP PRO (paid license too btw...)

In my case I had to change the location of the log file in order to get it to work...

Click on Mysql icon then the little folder to the right of the path and try changing it to something else.

i've solved this issue using this command in the terminal :

sudo apachectl stop