bad blackslash usage openvpn

[pinguim007]

helo

I am receiving this message on my vpn gui

Options warning: Bad backslash ('\') usage in client.ovpn:1: remember that backslashes are treated as shell-escapes and if you need to pass backslash characters as part of a Windows filename, you should use double backslashes such as "c:\\openvpn\\static.key"
Use --help for more information.

my client configuration.

client
dev tun
proto udp
remote x.x.x.x xxxx
resolv-retry infinite
nobind
persist-key
persist-tun
ca ca.crt
cert client.crt
key client.key
comp-lzo
verb 3

my server configuration

port XXXX
proto udp
dev tun
ca /etc/openvpn/easy-rsa/2.0/keys/ca.crt
cert /etc/openvpn/easy-rsa/2.0/keys/server.crt
key /etc/openvpn/easy-rsa/2.0/keys/server.key
dh /etc/openvpn/easy-rsa/2.0/keys/dh1024.pem
server 192.168.500.0 255.255.255.0
ifconfig-pool-persist ipp.txt
push "route X.X.X.X 255.255.255.0"
keepalive 10 120
client-to-client
comp-lzo
max-clients 1
user nobody
persist-key
persist-tun
status /var/log/openvpn-status.log
log /var/log/openvpn.log
log-append /var/log/openvpn.log
verb 6
script-security 2


do somebody knowns what is going on?

[Rubberman]

Is either the client or server a Windows machine?