[xwiki-devs] clone xwiki-platform fail

Hy, I wish to contribute to xwiki. I forked xwiki-platform and when I execute the clone command I get the following error: error: unable to create file xwiki-platform-core/xwiki-platform-application-mana ger/xwiki-platform-application-manager-api/src/main/java/com/xpn/xwiki/plugin/ap plicationmanager/core/doc/objects/classes/XObjectDocumentDoesNotExistException.j ava (No such file or directory) fatal: cannot create directory at 'xwiki-platform-core/xwiki-platform-classloade r/xwiki-platform-classloader-protocols/xwiki-platform-classloader-protocol-attac hmentjar/src/main/java/org/xwiki/classloader/internal/protocol/attachmentjar': N o such file or directory Can you help me or tell me how to get xwiki-platform on my computer for work. Best regards.