cannot load projects

[andreabat]

Hi,
on ubuntu(18.04) with openjdk version "1.8.0_171"
I get this exception when trying to load list of project from redmine.

2018-05-18 12:23:33.645 DEBUG - org.viewaframework.view.AbstractViewContainerSetting final UI state from view gui.redmine.RedmineProjectListView
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
2018-05-18 12:23:33.724 ERROR - org.apache.log4j.Category$error$1
2018-05-18 12:23:33.725 DEBUG - org.viewaframework.widget.view.ui.MasterViewModel[M:2 | V:2] gui.console.ConsoleViewEntry(ERROR, gui.redmine.RedmineProjectListController, Fri May 18 12:23:33 CEST 2018)