XAMPP won't load specific site

Hi guys, hoping you could share your thoughts on this with me.

I've got a Macbook pro and a PC running Win 7. I developed a site locally on my Mac and then transferred it to my PC. Everything worked fine.

After I edited it on my PC I transferred it back to my Mac (I travel a lot) and now I get this error when I try to load it in the browser:

Code:

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Warning: Unknown: failed to open stream: Permission denied in Unknown on line 0

Fatal error: Unknown: Failed opening required '/Applications/XAMPP/xamppfiles/htdocs/freewps/index.php' (include_path='.:/Applications/XAMPP/xamppfiles/lib/php:/Applications/XAMPP/xamppfiles/lib/php/pear') in Unknown on line 0

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I didn't really add anything new to the website I developed apart from Fancybox.net code and a bunch of other simple things.

This is the only site in my /htdocs directory which displays this error so I'm thinking there's something up with the site.

Need help please! Much appreciated :)