Ambari Server problem

[#1]

I am getting logs (ambari-server.log) like following for all the stacks after I install and start ambari-server :

21 May 2017 19:52:13,766 INFO [main] StackServiceDirectory:116 - No repository information defined for , serviceName=SPARK, repoFolder=/var/lib/ambari-server/resources/stacks/HDP/2.5/services/SPARK/repos

21 May 2017 19:52:13,766 INFO [main] StackServiceDirectory:116 - No repository information defined for , serviceName=YARN, repoFolder=/var/lib/ambari-server/resources/stacks/HDP/2.5/services/YARN/repos

21 May 2017 19:52:13,767 INFO [main] StackServiceDirectory:116 - No repository information defined for , serviceName=KNOX, repoFolder=/var/lib/ambari-server/resources/stacks/HDP/2.5/services/KNOX/repos

21 May 2017 19:52:13,768 INFO [main] StackServiceDirectory:116 - No repository information defined for , serviceName=ZOOKEEPER, repoFolder=/var/lib/ambari-server/resources/stacks/HDP/2.5/services/ZOOKEEPER/repos

What does these indicate? I checked and folders do not exist :

"/var/lib/ambari-server/resources/stacks/HDP/2.5/services/ZOOKEEPER/repos"

Are these "normal" traces ?