creating a user soes not work

log : tx_nG6_eid add_user 14-08-18 08:32 - Core: Exception handler (WEB): Uncaught TYPO3 Exception: Class 'tx_saltedpasswords_salts_factory' not found | Error thrown in file /save/ng6-test/src/ng6-git-gsalin/ui/nG6/lib/class.tx_nG6_utils.php in line 243. Requested URL: http://ng6-slurm.toulouse.inra.fr/ng6-mmanno/index.php?eID=tx_nG6&type=add_user&username=roboyer&first_name=Rox%C3%A9ne&last_name=Boyer&password=tfGdFAn4Kr&email=gerald.salin@inra.fr&creator=4&title=GENO&organism=INRA&location=Toulouse&project_id=88&right=0&pid=2&add_user_email=Dear%20%23%23%23USER_FIRST_NAME%23%23%23%20%23%23%23USER_LAST_NAME%23%23%23%2C%0AYou%20have%20now%20acccess%20to%20the%20%23%23%23PROJECT_NAME%23%23%23%20project%20%28%23%23%23PROJECT_DESCRIPTION%23%23%23%29%20accessible%20once%20logged%20in%20by%20the%20following%20url%3A%20%23%23%23PROJECT_LINK%23%23%23%0AThe%20NG6%20team%0APS%3A%20this%20is%20an%20automatic%20e-mail%20message%20generated%20by%20the%20NG6%20system.%20Please%20DO%20NOT%20RESPOND%20to%20this%20e-mail%20because%20the%20mail%20box%20is%20unattended.&add_user_title=[NG6]%20You%20have%20been%20added%20to%20a%20project&create_user_email=Dear%20%23%23%23USER_FIRST_NAME%23%23%23%20%23%23%23USER_LAST_NAME%23%23%23%2C%0APlease%20find%20bellow%20your%20login/password%20required%20to%20log%20into%20the%20NG6%20system%20%28%23%23%23PROJECT_LINK%23%23%23%29%3A%20%0A%20%20%20-%20login%3A%20%23%23%23USER_LOGIN%23%23%23%0A%20%20%20-%20password%3A%20%23%23%23USER_PASSWORD%23%23%23%0AThe%20NG6%20team%0APS%3A%20this%20is%20an%20automatic%20e-mail%20message%20generated%20by%20the%20NG6%20system.%20Please%20DO%20NOT%20RESPOND%20to%20this%20e-mail%20because%20the%20mail%20box%20is%20unattended.&create_user_title=[NG6]%20Account%20creation&from_email=support@ng6.toulouse.inra.fr&project_url=http%3A//ng6-slurm.toulouse.inra.fr/ng6-mmanno/index.php%3Fid%3D55%26tx_nG6_pi1%255Bproject_id%255D%3D88&send_an_email=true