Cmdbuild 2.5.1 with dockerfile - Failed to create default User/group

Hi, i have installed cmdbuild version 2.5.1 with tomcat 7 and PostgreSql v 10.5 with docker file.
It works fine, but when the cmdb_app container finish to start up in the log file appears the following message:
" INFO: Starting ProtocolHandler [“ajp-bio-8009”]
Oct 31, 2019 3:01:08 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 88358 ms
Failed to create default User/Group"
What does it means? i have to be worried about it or is a simple message the i can avoid?
thanks, sandra