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

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I keep getting this error whenever Im trying to use slackSend . I get this error even when I’m just trying to print “hello world” on a channel using slackSend .

WARNING jenkins.plugins.slack.StandardSlackService publish
Error posting to Slack
javax.net.ssl.SSLException: Received fatal alert: protocol_version
    at sun.security.ssl.Alerts.getSSLException(Alerts.java:208)
    at sun.security.ssl.Alerts.getSSLException(Alerts.java:154)
    at sun.security.ssl.SSLSocketImpl.recvAlert(SSLSocketImpl.java:1979)
    at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1086)
    at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1332)
    at sun.security.ssl.SSLSocketImpl.writeRecord(SSLSocketImpl.java:709)
    at sun.security.ssl.AppOutputStream.write(AppOutputStream.java:122)
    at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
    at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
    at org.apache.commons.httpclient.methods.EntityEnclosingMethod.writeRequestBody(EntityEnclosingMethod.java:506)
    at org.apache.commons.httpclient.HttpMethodBase.writeRequest(HttpMethodBase.java:2114)
    at org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java:1096)
    at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:398)
    at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
    at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
    at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)
    at jenkins.plugins.slack.StandardSlackService.publish(StandardSlackService.java:88)
    at jenkins.plugins.slack.workflow.SlackSendStep$SlackSendStepExecution.run(SlackSendStep.java:182)
    at jenkins.plugins.slack.workflow.SlackSendStep$SlackSendStepExecution.run(SlackSendStep.java:149)
    at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1$1.call(AbstractSynchronousNonBlockingStepExecution.java:49)
    at hudson.security.ACL.impersonate(ACL.java:213)
    at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1.run(AbstractSynchronousNonBlockingStepExecution.java:47)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

Please help I will highly appreciate any suggestions.