Heroku: Cannot run more than 1 Free size dynos

ruby-on-rails heroku heroku-toolbelt
Andrew picture Andrew · Jan 11, 2016 · Viewed 27.6k times · Source

I was trying to run 

heroku run rake db:migrate

And was getting the error

Cannot run more than 1 Free size dynos.

See below for how to fix...

Answer

Andrew picture Andrew · Jan 11, 2016

The answer is to look for any open heroku sessions (you can use 'heroku ps' as john points out below), in my case I already had a started a heroku console session 30mins earlier and just forgot about it. So if you see the "Cannot run more than 1 Free size dynos" error just close any existing console or other heroku sessions you have open.

Hopefully this saves someone the ten minutes it took me to come to my senses.

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