Error for mvn docker:build

[victorleungtw]

[ERROR] Failed to execute goal com.spotify:docker-maven-plugin:0.2.8:build (default-cli) on project spring-boot-prototype-docker: Exception caught: java.util.concurrent.ExecutionException: com.spotify.docker.client.shaded.javax.ws.rs.ProcessingException: org.apache.http.conn.HttpHostConnectException: Connect to localhost:2375 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused -> [Help 1]