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active_record/connection_adapters/abstract/connection_pool.rb:299:in `initialize': can't create Thread

状況:

rails c 叩いた時

エラー:

active_record/connection_adapters/abstract/connection_pool.rb:299:in `initialize': can't create Thread

config/database.ymlのコネクションプールを5 -> 10に変更で解決