What does this error "javax.net.ssl.SSLException" mean?

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Thank you soo much for your help. I agree with you but my company is still using jenkins1.609 with old plugins and we cant upgrade it, that’s why we all have to face such type of issues everyday :frowning:

I just have one doubt, even when I’m trying this-

slackSend teamDomain: "mycompany", channel: "#re-build", message: " Please Ignore ", tokenCredentialId: "slack-rebuild"

I still get the previously mentioned error. Is there any way to explicitly mention your slack credentials, so far I tried this -

WithCredentials([string(credentialsId: 'theSlackToken', variable: 'slackCredentials')]) {
    slackSend (channel: '@johnsmith', message: 'hello there', color: '#3eb991', failOnError: true, teamDomain: 'myteamsubdomain', token: slackCredentials)
}

But when I copy paste these above lines in my Jenkinsfile I get error saying no such DSL method string.