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There is no need for the use of special TYPO3 extensions to set up a multilingual 404 error page for Typo3 (version 6) and RealURL. It works with the normal TYPO3 Install settings as well. First, a 404 page in the root directory of the pages must be created. In the AdditionalConfiguration.php file in the directory / typo3conf following entry has to be done (id = page id of the error page, L = language):