Koha error

The following fatal error has occurred:

Host '10.0.16.6' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts' at /usr/share/koha/lib/C4/Context.pm line 666.
Compilation failed in require at /usr/share/koha/lib/C4/Circulation.pm line 25.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Circulation.pm line 25.
Compilation failed in require at /usr/share/koha/lib/C4/Overdues.pm line 24.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Overdues.pm line 24.
Compilation failed in require at /usr/share/koha/lib/C4/Members.pm line 27.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Members.pm line 27.
Compilation failed in require at /usr/share/koha/lib/C4/Auth.pm line 31.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Auth.pm line 31.
Compilation failed in require at /usr/share/koha/opac/cgi-bin/opac/opac-detail.pl line 24.
BEGIN failed--compilation aborted at /usr/share/koha/opac/cgi-bin/opac/opac-detail.pl line 24.