Dear Maintainer, I tracked this issue to the file /var/lib/redmine/Gemfile.lock which appears to have the wrong versions (probably due to having had a local version of ruby around), however, when I (re)move it and it is recreated, it does get the system installed versions back, so that part seems to be solved.
However, than the next error appears: config.eager_load is set to nil. Please update your config/environments/*.rb files accordingly: * development - set it to false * test - set it to false (unless you use a tool that preloads your test environment) * production - set it to true I'm now trying out how to solve it, but the bug can be closed... Best regards, Tjeerd Pinkert