error is
first log file
/var/log/rudder/webapp/2017_03_22.stderrout.log.110159129:[2017-03-22 11:01:47] INFO bootchecks - Check initialization of User Technique Library
/var/log/rudder/webapp/2017_03_22.stderrout.log.110159129:[2017-03-22 11:01:47] INFO application - The Active Technique library is not marked as being initialized: adding all policies from reference library...
second log file
[2017-03-22 11:02:36] INFO bootchecks - Check initialization of User Technique Library
[2017-03-22 11:02:36] INFO application - The Active Technique library is not marked as being initialized: adding all policies from reference library...
[2017-03-22 11:02:40] WARN application - Some error where encountered during the initialization of the user library
-> Error when adding Technique 'clockConfiguration' into user library category 'misc'
-> Error when adding Technique 'fstabConfiguration' into user library category 'systemManagement'
-> Error when adding Technique 'hostsConfiguration' into user library category 'networking'
-> Error when adding Technique 'fileAlterationMonitoring' into user library category 'security'
-> Error when adding Technique 'sudoParameters' into user library category 'userManagement'
-> Error when adding Technique 'sshKeyDistribution' into user library category 'remoteAccess'
-> Error when adding Technique 'sshConfiguration' into user library category 'remoteAccess'
-> Can not add a technique with id sshConfiguration in user library. active technique activeTechniqueId=1b708e34-1fb6-4ecc-b9d1-91b056b5ea32,techniqueCategoryId=remoteAccess,techniqueCategoryId=systemSettings,techniqueCategoryId=Active Techniques,ou=Rudder,cn=rudder-configuration is already defined with such a reference technique.