I'm using symfony 1.4.5, and I'm following the Jobeet tutorial currently on Day 6.
I ran into the same error when trying to run "php symfony doctrine:data-load" in the terminal. The solution I found was quite simple, make sure that you are in the symfony project directory when running the command (mine was /home/myusername/sfprojects/jobeet/)
My ProjectConfiguration.class.php file was okay as it had "$this->enablePlugins('sfDoctrinePlugin');", and I was able to run doctrine:data-load in the earlier days of the tutorial. So I didn't have to touch that.
Hope this helps.