Hello, I try to install extension "Batch Import API" with Extension Manager: 1st try: Resolving extension [Batch Import API 1.0] on namespace [wiki:xwiki] Applying INSTALL for extension [Batch Import API 1.0] on namespace [wiki:xwiki] Failed to get fields for class [org.xwiki.batchimport.internal.iterators.CSVImportFileIterator] because the class [Lau/com/bytecode/opencsv/CSVReader;] couldn't be found in the ClassLoader. 1/ I suppose that Extension Manager works like maven and so is able so solved dependencies. Am I wrong? 2/ If extension manager managed dependencies, I suppose that "Batch Import API" need some dependency declaration. IMO, extension like "Batch Import API" provided as jar should have dependency declaration to be tagged as "Installable with Extension Manager" in Extension pages 2nd try after manual installation of openCSV in WEB-INF/lib Resolving extension [Batch Import API 1.0] on namespace [wiki:xwiki] Applying INSTALL for extension [Batch Import API 1.0] on namespace [wiki:xwiki] Failed to get fields for class [org.xwiki.batchimport.internal.iterators.ExcelImportFileIterator] because the class [com/xpn/xwiki/plugin/excel/ExcelPluginException] couldn't be found in the ClassLoader. 3/ "Batch Import API" page wrong information. from installation, it looks to be mandatory: X-CONTRIB-183 Regards, Arnaud.