Has any one installed subscript engine. I having trouble completing the installation: When I run rake db:migrate:engines:substruct I get the following error; (in /Users/peterw/railsapps/webprint) Migrating engine ''substruct'' == AddUserAndContact: migrating ==============================================-- add_column(:questions, :email_address, :string, {:limit=>50}) -> 0.1110s -- change_column(:questions, :answered_on, :datetime, {:null=>true}) rake aborted! Mysql::Error: Invalid default value for ''answered_on'': ALTER TABLE questions CHANGE answered_on answered_on datetime DEFAULT '''' Thanks