Hello, I translate my previous mail of yesterday in English... I had problems to migrate from release 1.24.1 to 1.26.2 I made a copy of Msql database from the earlier release I made also a copy of the 1.24.1 extensions directory not present in 1.26.2 package In LocalSettings.php I had to move the line enableSemantics ( 'gide-formation.culture.fr' ); farther in the file. Now, when I do php maintenance/update.php it gives the result : PHP Fatal error: Unsupported operand types in /var/www/html/mediawiki-1.26.2/extensions/SemanticDrilldown/SemanticDrilldown.php on line 144 Here are the recapitulation of my current extensions (resulting from merge): AdminLinks Interwiki Poem SemanticResultFormats Cite LdapAuthentication README SpamBlacklist CiteThisPage Lingo Renameuser SyntaxHighlight_GeSHi ConfirmEdit LocalisationUpdate ReplaceText TitleBlacklist DataTransfer Maps SemanticDrilldown Validator ExternalData Nuke SemanticForms VisualEditor Gadgets PageSchemas SemanticFormsSelect WikiEditor HeaderTabs ParserFunctions SemanticGlossary ImageMap PDFEmbed SemanticMaps InputBox PdfHandler SemanticMediaWiki As attachment, my file LocalSettings.php wihtout passwords ---------------------------------------------------------------------- Merci de nous aider à préserver l'environnement en n'imprimant ce courriel et les documents joints que si nécessaire.