Trying to reproduce the error on https://github.com/tootsuite/mastodon/issues/4039

trial-on-freebsd.sh

$ uname -srm
FreeBSD 11.0-RELEASE-p9 amd64
$ su
# pkg install ruby-2.3.4_1,1
# pkg install git-2.13.2
# exit
$ git clone https://github.com/tootsuite/mastodon.git
$ cd mastodon
$ ruby -v -rpsych -e 'p Psych.load(IO.read("config/sidekiq.yml"))'
ruby 2.3.4p301 (2017-03-30 revision 58214) [amd64-freebsd11]
{:concurrency=>5, :queues=>["default", "push", "pull", "mailers"], :schedule=>{"subscriptions_scheduler"=>{"cron"=>"0 5 * * *", "class"=>"Scheduler::SubscriptionsScheduler"}, "media_cleanup_scheduler"=>{"cron"=>"5 4 * * *", "class"=>"Scheduler::MediaCleanupScheduler"}, "feed_cleanup_scheduler"=>{"cron"=>"0 0 * * *", "class"=>"Scheduler::FeedCleanupScheduler"}, "doorkeeper_cleanup_scheduler"=>{"cron"=>"1 1 * * 0", "class"=>"Scheduler::DoorkeeperCleanupScheduler"}}}

trial-on-netbsd.sh

$ git clone https://github.com/tootsuite/mastodon.git
$ cd mastodon
$ git checkout v1.4.7
$ ruby23 -v -rpsych -e 'p Psych.load(IO.read("config/sidekiq.yml"))'
ruby 2.3.4p301 (2017-03-30 revision 58214) [x86_64-netbsd]
{:concurrency=>5, :queues=>["default", "push", "pull", "mailers"], :schedule=>{"subscriptions_scheduler"=>{"cron"=>"0 5 * * *", "class"=>"Scheduler::SubscriptionsScheduler"}, "media_cleanup_scheduler"=>{"cron"=>"5 4 * * *", "class"=>"Scheduler::MediaCleanupScheduler"}, "feed_cleanup_scheduler"=>{"cron"=>"0 0 * * *", "class"=>"Scheduler::FeedCleanupScheduler"}, "doorkeeper_cleanup_scheduler"=>{"cron"=>"1 1 * * 0", "class"=>"Scheduler::DoorkeeperCleanupScheduler"}}}