OpenVPN key generation issue

If you see an error during openvpn (my version was OpenVPN 2.3.2 -- released on 2013.06.03 under Windows 7 32bit) key generation
"failed to update database
TXT_DB error number 2"
then remember to re-type unique choices like CN, Email, etc. that are given in square brackets [] - example below:
Country Name (2 letter code) [CH]:CH
State or Province Name (full name) [VD]:VD
Locality Name (eg, city) [Lausanne]:Lausanne
Organization Name (eg, company) [org]:org
Organizational Unit Name (eg, section) [VPN]:VPN
Common Name (eg, your name or your server's hostname) [server]:server
Name [Dan]:Dan
Email Address [admin@contoso.com]:admin@contoso.com