"deprecation warning: you have rails 2.3-style plugins in vendor/plugins! support will be removed in rails 4.0 " Code Answer

4

vendor/plugins isn't the problem here, those are only warnins. it's heroku run rake db:migrate..

possibly just heroku rake db:migrate if you're not on the cedar stack (note migrate, not migration)

By Varun Chakervarti on February 8 2022

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