Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist

I'm using instant rails with mysql Front. Does anyone know why I may
be getting this error message and what to do about it???

Your grants don't seem to be in order. Have a look at the docs to
gain a better understanding of what you need to do:

http://dev.mysql.com/doc/refman/5.0/en/account-management-sql.html