Hello Feng Libo, I found this bug, when i update EDK2 sources. You should remove directories Build , Conf and BaseTools. Then restore the source code of the BaseTools ( git reset --hard HEAD ). Then rebuild tools by make -c BaseTools/ and update environment by source edksetup.sh. After this You can apply settings for the target in Conf/target.txt. -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#121207): https://edk2.groups.io/g/devel/message/121207 Mute This Topic: https://groups.io/mt/111636381/7686176 Group Owner: devel+owner@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [rebecca@openfw.io] -=-=-=-=-=-=-=-=-=-=-=-