그누보드를 설치하고 난후 에러메시지가 나옵니다.

그누보드를 설치하고 난후 아래 메세지처럼 에러메시지가 나옵니다.
어떻게 수정해야 되나요?

Warning: Unknown: open(../gnubbs/data/session/sess_75796b3f0feaf2dde62eeabd395d2327, O_RDWR) failed: No such file or directory (2) in Unknown on line 0

Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (../gnubbs/data/session) in Unknown on line 0