Route_all_traffic openVPN

on a balance 20 version 8.00, i have a problem with openvpn.
it’s working fine and now i can connect with my account (remote user) but have an alert " connection with route_all_traffic failed"

on the dhcp server , my connection OPENVPN is enregistred but no possibility to join the local network

do you have an idea , where to look at ?