Incorrect message on install process

drupal_set_message(t('Your Scribe API Key is Empty. Please ') . l(t('configure the Scribe Content Optimizer plugin.'), 'admin/settings/scribeseo'), 'error');

1. There is incorrect usage of t() function. Take a look to api docs.
2. Why you set error message? It means your module can not be installed without errors. In addition, drush enable command interprets that message like a fail. Thereby, your module can break deployment process on some sites. There must uses common message.