I don't know what is happening
experimentx@workmateX:/var/www$ sudo chmod 0777 -r /var/www/ chmod: cannot access `0777': No such file or directory experimentx@workmateX:/var/www$
sudo chmod 0777 -R /var/www/
-R instead of -r.
Use "-R" instead of "-r".
From the chmod help:
-R, --recursive change files and directories recursively
Also note that the 0 will no longer clear suid/sgid/sticky in recent versions of chmod and you'll soon have to use a symbolic mode (if that's what you're intending to do).
Perhaps going or directing the file in terminal and once you locate file by:
then run the command:
chmod +x filename
from that location I'm sure it will work.