[xwiki-users] How to delete imported xar

Hello, I've imported some xar with data (each +- 60mo), but sometimes I got a error during import (error in my xar or xar too huge ). When I tried to delete this xar, it's seems working but when I refresh go back to the Administration/Import page, the file come back in the list. I tried 2 times again and still the same. It's a fresh install of Xwiki 6.1 on Tomcat and Oracle db. Thanks for help Patrick