I did installed the previous version before. But I did not get that version to work, so I gave up. Lately I wanna give SFML another try. I downloaded latest version 2.2. I deleted everything SFML related under /Library/Frameworks, and copied new 2.2 files to there. I installed SFML as frameworks since it is recommended.
I just deleted SFML files under /Library/Frameworks, and tried again, the problem persists. Is there any old files under some other folders I should delete? Thanks