Apache: 3 virtual hosts working perfectly, 1 is not, but settings seem to be the same (Mac) - apache

Question

(OSX Leopard 10.5.8)
I've been using virtual hosts with no problems until now, when I tried to make a new block of code for the next one. The offender is called project1.
I've got an index.php sitting in the project1/html/ folder, just like all the others. But every time I try to go to http://project1/ in the browser I get a 404.
Here's the contents of httpd-vhosts.conf:
<VirtualHost *:80>
ServerName localhost
DocumentRoot "/Users/sebu/_SERVER/"
</VirtualHost>
<VirtualHost *:80>
ServerName skeleton
DocumentRoot "/Users/sebu/_SERVER/skeleton/public_html/"
</VirtualHost>
<VirtualHost *:80>
ServerName pickle
DocumentRoot "/Users/sebu/_SERVER/pickle/"
</VirtualHost>
<VirtualHost *:80>
ServerName project1
DocumentRoot "/Users/sebu/_SERVER/project1/html/"
</VirtualHost>
Here's what I've checked already:
I restarted Apache (every time I change something).
I tried clearing the browser cache.
I tried rebooting.
I made sure the file permissions are exactly the same as the other working vhosts (dirs and files).
I've got the line Options Indexes +FollowSymLinks -MultiViews in httpd.conf (turning Multiviews off was the solution to an earlier problem).
I ran httpd -S to check the syntax and it said everything was OK.
I tried pinging project1 just to check and sure enough it says cannot resolve project1: Unknown host
(Not sure if it's worth mentioning, but when I did a ls -la in _SERVER/ I noticed that project1/ had permissions written as drwxr-xr-x# with the # on the end. I read that this meant it was a quarantined file and would wait for me to open it so I ran open project1/ and it went away.)

Answer 1

do you have an entry in /etc/hosts for skeleton, pickle, but not project1? If so, add an entry for project1 and that should resolve your issue.