When I had the problem, there may have been other copies of the same extension (same extension key) in typo3conf/ext. This may cause problems (even if these extensions are not enabled). When I had the problem, there may have been other copies of the same extension (same extension key) in typo3conf/ext. This may cause problems (even if these extensions are not enabled). When I had the problem, there may have been other copies of the same extension (same extension key) in typo3conf/ext. This may cause problems (even if these extensions are not enabled).