[SOLVED][Drupal Errors][Drupal 6] An image thumbnail was not able to be created.

| | 1 min read

Many Drupal users encountered this error "An image thumbnail was not able to be created." when trying to upload a picture to Drupal 6.x. If you are encountering this same error in your Drupal site then read on to find out the solution.

This error was likely caused by the security settings and permissions on the files folders as well as the sub-folders. Drupal was attempting to write a file on the server but was denied permission to do so. To fix the error follow the steps below

  • You need to change the permissions on one or all of the following files depending on your Drupal setup. You need to enable write permissions for the same by using CHMOD 755
    /sites/default/files/
    /files/
    /sites/your-domain-name-here.com/files/
  • Remember to apply the permissions to all subfolders except those which specifically discourage that. Check out the README.txt file accompanying the module. Folders like backup_migrate should not have write permissions.

Hope that helps.

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