[support] Warning in module Document

[Lázaro Morales]

Hello,

After I installed the module Document[1] in Drupal, I get a warning  
message:

  Warning: Parameter 1 to document_search_form() expected to be a  
reference, value given
  in retrieve_form() (line 772 of /var/www/intranet/includes/form.inc).

What this mean?

Thanks in advance,

Best regards,
Lázaro.

[1] version: 7.x-1.x-dev ->  
http://ftp.drupal.org/files/projects/document-7.x-1.x-dev.tar.gz

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