svn: E175002: Unexpected HTTP status 503 'Service Unavailable'

When running the svn checkout command

sudo svn co http://svn.observium.org/svn/observium/branches/stable observium

After running downloading/checkout multiple files including mibs and various scripts the following error pops up:

svn: E175002: Unexpected HTTP status 503 'Service Unavailable' on '/svn/!svn/rvr/6676/observium/trunk/scripts/agent-local/nfsd'

Even though there is no reference to this in the install document/link the following has been done:

/opt/observium given full rwx permissions i.e. chmod 777

apache2.conf in /etc/apache2 edited as follows:

<Directory /repos>
    require all granted
    </Directory>

<Directory /opt/observium>
    require all granted
    </Directory>

Still get the same error each time.

The checkout did give further and the following error was received:

svn: E000104: Error running context: Connection reset by peer

There is no proxy in place and the firewall logs show accepts and no drops.

Any help would be appreciated