Error while trying to find the common path for enabled extensions of project views_rss. Extensions are: views_rss, views_rss_core, views_rss_dc

Hello,

While attempting to download two different modules using drush, I received the above error. I entered the following on the command line:

$drush dl term_reference_tree

$drush dl entityreference

drush version: 7.0-dev

Thank you,
Ann