An error in your system configuration has been detected
General installation instructions can be found
here.
For more specific hints on the existing issues please have a look at the messages below. 
It looks like the media directory is not writable by the webserver. Please change the permissions of /var/www/html/pawtucket/media/collectiveaccess (or create it if it doesn't exist already) and enable the user which runs the webserver to write to this directory.