The full-text index is not working in my installation

[vlopez]

Regards.

LetoDMS version 3.4.2
PHP 5.3.21
MySQL 5.5.3
Linux Server (Centos)

When I try to generate the full-text index shows me the following message to all documents:
Notice: Undefined variable: settings in /my/path/to/letodms/out/out.Indexer.php on line 41

In the configuration settings I have given stopwords file path. The files have the comment box stuffing, and I have installed both pdftotext as cat.
The files that are currently in the database are four and their extensions: txt, pdf, odt and doc

Thanks in advance.