Heroku Rails app v 1.2.6 failed to push: unrecognized error

I get this error when trying to push a Rails app v. 1.2.6 to Herok开发者_如何学Cu:

 !     Heroku push rejected due to an unrecognized error.
 !     We've been notified, see http://support.heroku.com if the problem persist
s.


To git@heroku.com:myproject.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'git@heroku.com:myproject.git'

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Heroku doesn't support Rails below 2.0. It might be painful but if you want to stay with Heroku you'd have to upgrade to at least Rails 2.3.5.

http://devcenter.heroku.com/articles/rails

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It seems it's your gemfile. If your are using sqlite3, change the line gem sqlite3 to gem pg.

http://devcenter.heroku.com/articles/rails3