Unable to run OpenVpn


I get this error when I try to run OpenVpn

OpenVPN 2.3.2 x86_64-pc-linux-gnu [SSL (OpenSSL)] [LZO] [EPOLL] [PKCS11] [eurephia] [MH] [IPv6] built on Dec  1 2014
Enter Auth Username:anmol
Enter Auth Password:
 WARNING: No server certificate verification method has been enabled.  See http://openvpn.net/howto.html#mitm for more info.
Socket Buffers: R=[212992->131072] S=[212992->131072]
 UDPv4 link local: [undef]
 UDPv4 link remote: [AF_INET]
 TLS: Initial packet from [AF_INET], sid=6f021081 ab0d138e
 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this
VERIFY ERROR: depth=2, error=self signed certificate in certificate chain: C=IL, O=StartCom Ltd., OU=Secure Digital Certificate Signing, CN=StartCom Certification Authority
TLS_ERROR: BIO read tls_read_plaintext error: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failedTLS Error: TLS object -> incoming plaintext read error TLS Error: TLS handshake failed
SIGUSR1[soft,tls-error] received, process restarting
Restart pause, 2 second(s)

Any solution ?

Can you post the certificate used to make the TLS connexion ?

How to copy certificate ?