Thin_redmine and Thin_redmine2 stopped on moving to plugin directory

[shah-ganesh]

On moving the due_date_reminder_1.4.x plugin to plugin directory, thin_redmine and thin_redmine2 server stopped even after restarting all the servers. Also on migrating the plugin, error message: rake aborted! Expected C:Bitnami/.../htdocs/apps/models/User.rb to define user Tasks: Top => db:migrate_plugins => environment.
Need help!!! Thanks in Advance