when I install civicrm-4.7.29-drupal on Drupal-7.56 just using one database for drupal an civicrm the installation runs perfectly without any errors. If I use two databases for drupal and civicrm I get the following error message: CRM_Core_Exception: Found installation canary. This suggests that something went wrong with tracking installation process. Please post to forum or JIRA. in Civi\Core\InstallationCanary::check() (line 53 of /[my website]/sites/all/modules/civicrm/Civi/Core/InstallationCanary.php). What did I do wrong? Or is it a bug? Best, Frank
I came accross this error a few weeks ago and it indicates that you are trying to install CiviCXM into a drupal environment which already contains an installed version of CiviCRM.