Unable to access Drupal: Cannot add duplicate collection entry of type 'rule' with unique key attribute

Created:

2016-12-12 03:40:33 UTC

Modified:

2017-08-08 13:30:45 UTC

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Unable to access Drupal: Cannot add duplicate collection entry of type 'rule' with unique key attribute

Applicable to:

  • Plesk 12.5 for Windows

Symptoms

  • Unable to access Drupal instance, the following error occurs:

    Config Error       Cannot add duplicate collection entry of type 'rule' with unique key attribute 'name' set to 'Protect files and directories from prying eyes'
    Config File \\\\?\\C:\\Inetpub\\vhosts\\drupal.example.com\\httpdocs\ estdirectory\\web.config
  • There are two installations of Drupal under one domain.

Cause

This is default behavior of Drupal.

Resolution

This way of Drupal installation is not recommended since web.config 's can conflict with each other.

In order to achive the goal to use multiple Drupal installations use Multi-site Drupal functionality.

Additional information can be found at Drupal Documentation .

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