Decrypt openvpn ssl traffic with wireshark


I would like to decrypt the ssl traffic of openvpn with wireshark. I captured the encrypted traffic with wireshark and want to click on “follow SSL Stream” but I can not click it.
under Edit–>Preferences–>Protocols–>SSL–>RSA Key List–>Edit:
I had added the rule with:

IP Address: "the source ip adress where the packets came from"
Port: 1194
Protocol: udp
Key File: "destination of my certs.p12 file"
Password: “my korrekt certs.12 password”

Wireshark is not decrypting the packets and I can not click on “follow SSL Stream”.

Have somebody any Idea?