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

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

How to solve 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
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