Un article de PhpMyVisites documentation.
Problem! Cannot write in the folder(s) /config /datas /datas/archives /datas/cache_artichow /datas/cache_lite /datas/cache_smarty /datas/tpl_compiled Try to chmod the phpMyVisites root directory also Please verify that you have the rights necessary to create files on the server (try to CHMOD 755 the folder with your FTP software : right click on the directory -> Permissions (or CHMOD).
If the CHMOD doesn't work with your FTP software, try to delete (if it exists) the directories, and create them with your FTP software.
QUE FAUT IL FAIRE