I am trying to ingest Jenkins events into splunk based on this link https://wiki.jenkins.io/display/JENKINS/Splunk+Plugin+for+Jenkins, based on document, I have gone through the steps, and downloaded the Zip file from the git repository splunk-devops-plugin-master and when tried to execute the mvn package command I am getting the above error message. 

Note: I am not a developer and new to Jenkins and my intention is to ingest Jenkins Events into splunk. Please do guide me how to package the jar file using the splunk-devops-plugin-master.