Now you have you answer. Either the symbolic link is not allowed or does not exist.
Can you
Code:ls -l /home/faride/domains/xxx.eu/public_html/index.php
What happens when you ls the symbolic link?
root@web:~# ls -l /home/faride/domains/xxx.eu/public_html/index.php
lrwxrwxrwx 1 root root 54 Apr 5 00:51 /home/faride/domains/xxx.eu/public_html/index.php -> /home/faride/domains/xxx.lt/public_html/index.php