Permission denied error [Phil Sturgeon rest liberary]

[eluser]mak.gnu[/eluser]
Trying to use Phil Sturgeon rest liberary but when I run the server I get following error.

all my other projects works fine in same machine except this.

Code:

Warning: Unknown: failed to open stream: Permission denied in Unknown on line 0 Fatal error: Unknown: Failed opening required '/var/www/restserver/index.php' (include_path='.:/usr/share/php:/usr/share/php/PEAR') in Unknown on line 0