hudson.plugins.redmine.MetricsException: com.taskadapter.redmineapi.RedmineException: No such project. projectName=sys83x
Build step 'Aggregate Redmine ticket metrics' marked build as failure

Workaround when using RedminePlugin v0.15:
use the "project name" instead of the "project identifier" from Redmine project under "Redmine project name" in the Jenkins project configuration. In this case other feature will not work anymore like repository browsing/link to redmine project/etc but aggregation
it seems to be a misconfiguration in the issue aggregation