Error occurs while configuring self signed ssl certificate using private IP

Hi folks,

I try to deploy bitwarden in my own server using ubuntu platform (self-hosted)
I configure all the stuff using bitwarden self-hosted documentation and using local IP, I deploy bitwarden
but the problem while i Configuring self signed ssl certificate using private IP by openssl. i faced some error regarding to bad substitution for understand clearly please find the screenshot
what action should I take to overcome the error and use the bitwarden in my own server
please let me know someone