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Heroku: Cannot run more than 1 Free size dynos

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...

Solution

  • Most Efective

    in console run: 

    heroku ps

    the result is some like this:

    run.4859 (Free): up 2016/01/12 21:28:41 (~ 7m ago): rails c

    So the numbers 4859 represent the session that is open and needs to be closed. To fix the error you need to run(Obviusly, replace the number 4859 by the number obtained):

    heroku ps:stop run.4859

    It is a very simple solution.