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You're using a password-protected key/certificate.
You could check the openvpn manual and check if you can use the "askpass" option, which requires you to place the password in some text file accessible to openvpn.
Alternatively, you could remove the password from the key, using openssl.
But probably there's a reason why your key is password protected, so check if you can (are allowed to, e.g. employer) remove the password or store it in a text file.