Heartbreak, please reload every SQL table. if you have ever updated your server, please do the SQL upgrades.
to make it easy (but you'll lose everything), drop the ragnarok database, create a new one. then, reload main.sql and logs.sql on your ragnarok database (schema).
@Jasc, please do not mention SVN anymore. we are now using GIT. some guides asks users to use SVN and it leads to a horrible error. The guide as well as the rAthena SVN are outdated. Only for rAthena's SVN.