Mysql.Data

[bryce16]

Iv'e been studying a pretty decent source bit by bit and got some understanding of it so far however I saw this error(rarely happens) when creating a new character and attempting to login.
What EXACTLY is the Mysql.Data telling me?

MySql.Data.MySqlClient.MySqlException (0x80004005): Duplicate entry '' for key 'PRIMARY'
   at MySql.Data.MySqlClient.MySqlStream.ReadPacket()
   at MySql.Data.MySqlClient.NativeDriver.GetResult(Int32& affectedRow, Int32& insertedId)
   at MySql.Data.MySqlClient.Driver.GetResult(Int32 statementId, Int32& affectedRows, Int32& insertedId)
   at MySql.Data.MySqlClient.Driver.NextResult(Int32 statementId, Boolean force)
   at MySql.Data.MySqlClient.MySqlDataReader.NextResult()
   at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)
   at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader()
   at MySql.Data.MySqlClient.MySqlCommand.ExecuteScalar()

If further explanation is needed please ask.

[corbit15]

idk much bout mysql but it says

Duplicate entry '' for key 'PRIMARY'

look at your error im assuming your accounts database or characters database. (wherever "primary" is) and make sure there isn't two sections named Primary