'heroku run python manage.py migrate' fails with an error 'Error R13 (Attach error) -> Failed to attach to process'

i have tried 'heroku run python manage.py migrate' and get " Timeout awaiting dyno, see http://ift.tt/1BEyfgE" error.

heroku logs

 2015-05-06T05:42:05.881706+00:00 heroku[api]: Starting process with command `manage.py db:migrate` by navajyothms1989@gmail.com

2015-05-06T05:42:22.537124+00:00 heroku[run.9766]: Awaiting client 2015-05-06T05:42:22.789430+00:00 heroku[run.9766]: State changed from starting to up 2015-05-06T05:42:52.552578+00:00 heroku[run.9766]: Error R13 (Attach error) -> Failed to attach to process 2015-05-06T05:42:53.293185+00:00 heroku[run.9766]: Process exited with status 128 2015-05-06T05:42:53.307222+00:00 heroku[run.9766]: State changed from up to complete

What should I do to solve this problem?