I have change the configuration file in kafka-manager-1.3.3.6/target/universal/kafka-manager-1.3.3.6/conf/application.conf from

akka {
  loggers = ["akka.event.slf4j.Slf4jLogger"]
  loglevel = "INFO"
}

to

akka {
  loggers = ["akka.event.slf4j.Slf4jLogger"]
  loglevel = "INFO"
  logger-startup-timeout = 30s
}