Would Sani-Tred work in humid basement?

Newly renovated cottage has a problem with mold on the basement walls, and ceiling. There is no water leaking into the basement or coming up through the floors but there is a lot of humidity coming up through. The floors are dry, and so are the walls, and ceiling to touch. Inside and outside weeping tiles were installed with tarred outside wall but no plastic underneath the cement floor, and the cement is only about 2-3 inches thick. Would Sani-Tred fix this problem before I put sub floors down? Also could this problem be caused from another source. Advice or suggestions would be great.