can't figure out what's wrong with mybatis input parameter expressions in file "GuestBoardMapper.xml".
The entire code works almost exactly as  I desired  right in front of the door, "GuestBoardDAOImpl.java",
but the mybatis mapper can't understand the input parameter inside the insert query.

The error message goes like this:
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Syntax error: unexpected 'FROM' [CAS INFO-localhost:33000,2,4312],[SESSION-1382],[URL-jdbc:cubrid:localhost:33000:nhnentdb:dba:********:?charSet=utf-8].
### SQL: INSERT FROM guestboard (id, email, passwd, content, created, modified)   VALUES (    NULL,    ?,    ?,    ?,    SYS_DATETIME,    NULL   )
### Cause: cubrid.jdbc.driver.CUBRIDException: Syntax: In line 1, column 8 before ' guestboard (id, email, passwd, content, created, modified)
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which says the mapper couldn't get the input parameter represented as like #{email}, #{passwd} or #{content}.

I'm currently working on it to solve the problem.