OPENVPN error "Cannot open TUN/TAP dev /dev/net/tun: Permission denied (errno=13)"

Hi I get the following error when I try to run openvpn in my Ubuntu Server

Fri Jan 8 02:12:59 2010 OpenVPN 2.1_rc11 i486-pc-linux-gnu [SSL] [LZO2] [EPOLL] [PKCS11] built on Mar 9 2009
Fri Jan 8 02:12:59 2010 WARNING: --keepalive option is missing from server config
Fri Jan 8 02:12:59 2010 NOTE: the current --script-security setting may allow this configuration to call user-defined scripts
Fri Jan 8 02:12:59 2010 Diffie-Hellman initialized with 1024 bit key
Fri Jan 8 02:12:59 2010 WARNING: file '/etc/openvpn/easy-rsa/2.0/keys/server.key' is group or others accessible
Fri Jan 8 02:12:59 2010 /usr/bin/openssl-vulnkey -q -b 1024 -m
Fri Jan 8 02:12:59 2010 TLS-Auth MTU parms [ L:1543 D:140 EF:40 EB:0 ET:0 EL:0 ]
Fri Jan 8 02:12:59 2010 ROUTE default_gateway=192.0.2.1
Fri Jan 8 02:12:59 2010 Note: Cannot open TUN/TAP dev /dev/net/tun: Permission denied (errno=13)
Fri Jan 8 02:12:59 2010 Note: Attempting fallback to kernel 2.2 TUN/TAP interface
Fri Jan 8 02:12:59 2010 Cannot allocate TUN/TAP dev dynamically
Fri Jan 8 02:12:59 2010 Exiting

This is my config file for server side

dev tun
proto tcp
port 1194

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

user nobody
group nogroup
server 10.8.0.0 255.255.255.0

persist-key
persist-tun

#status openvpn-status.log
#verb 3
client-to-client

push "redirect-gateway def1"

log-append /var/log/openvpn
comp-lzo 

I'm runining from my root account. So I don't know why the permission is denied. Also if I type in modprobe tun I get the following output.

WARNING: Deprecated config file /etc/modprobe.conf, all config files belong into /etc/modprobe.d/. FATAL: Could not load /lib/modules/2.6.18-128.2.1.el5.028stab064.7ent/modules.dep: No such file or directory