Koha error

The following fatal error has occurred:

Host 'koha.aua.am' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts' at /usr/local/lib/perl5/5.8.8/CGI/Carp.pm line 314.
Compilation failed in require at /opt/htdocs/jf/lib/C4/Circulation.pm line 25.
BEGIN failed--compilation aborted at /opt/htdocs/jf/lib/C4/Circulation.pm line 25.
Compilation failed in require at /opt/htdocs/jf/lib/C4/VirtualShelves.pm line 27.
BEGIN failed--compilation aborted at /opt/htdocs/jf/lib/C4/VirtualShelves.pm line 27.
Compilation failed in require at /opt/htdocs/jf/lib/C4/VirtualShelves/Page.pm line 26.
BEGIN failed--compilation aborted at /opt/htdocs/jf/lib/C4/VirtualShelves/Page.pm line 26.
Compilation failed in require at /opt/htdocs/jf/opac/cgi-bin/opac/opac-shelves.pl line 23.
BEGIN failed--compilation aborted at /opt/htdocs/jf/opac/cgi-bin/opac/opac-shelves.pl line 23.