Deploying of MongoDB cluster fails

Hi!

I tried to set up a MongoDB ReplicaSet. All goes well until it tries to initiate the cluster. I get the following error messages:

• [14:48:44]: Failed to initiate replicaset my_mongodb_1. Error:
  not authorized on admin to execute command { replSetInitiate: { _id: "my_mongodb_1", members: [ { _id: 0.0, host: "server1.example.com:27017", arbiterOnly: false, hidden: false, priority: 1.0, slaveDelay: 0.0, votes: 1.0 }, { _id: 1.0, host: "server2.example.com:27017", arbiterOnly: false, hidden: false, priority: 1.0, slaveDelay: 0.0, votes: 1.0 }, { _id: 2.0, host: "server3.example.com:27017", arbiterOnly: false, hidden: false, priority: 1.0, slaveDelay: 0.0, votes: 1.0 } ] }, $db: "admin" }
• [14:48:44]: server3.example.com:27017: Evaluating command by mongo client on the remote host: JSON.stringify(rs.initiate({_id: "my_mongodb_1", members: [{_id: 0, host: "server1.example.com:27017" , arbiterOnly: false, hidden: false, priority: 1, slaveDelay: 0, votes: 1},{_id: 1, host: "server2.example.com:27017" , arbiterOnly: false, hidden: false, priority: 1, slaveDelay: 0, votes: 1},{_id: 2, host: "server3.example.com:27017" , arbiterOnly: false, hidden: false, priority: 1, slaveDelay: 0, votes: 1}]}));
• [14:48:44]: server3.example.com: Initiating replicaset my_mongodb_1.
  
  

Please note the attached screenshots. Those show my config for the cluster minus the nodes.