while doing a drupal 6 to 7 upgrade I am getting the not so helpful message
\"The website encountered an unexpected error. Please try again later.\" everytime I go to certa
You definitely should be disabling all contrib modules to perform the upgrade. Then enable them a few at a time after they have been replaced with the D7 version. When replacing the module, be sure to clean out the entire module directory, just in case some old files remain.
This should help narrow down the problem and be sure to check the php error log in case you find something there. (Although that is usually in the case of the White Screen Of Death.)