I solved the problem by giving mirroring path:
SOURCE_MIRROR_URL ?= "file:///path to downloads folder "
INHERIT += "own-mirrors"
BB_GENERATE_MIRROR_TARBALLS = "1"
and i have two warning:
WARNING: kern-tools-native-0.2+gitAUTOINC+85564e6955-r12 do_fetch: Failed to fetch URL git://git.yoctoproject.org/yocto-kernel-tools.git, attempting MIRRORS if available
WARNING: kmod-native-23+gitAUTOINC+65a885df5f-r0 do_fetch: Failed to fetch URL git://git.kernel.org/pub/scm/utils/kernel/kmod/kmod.git, attempting MIRRORS if available
NOTE: Tasks Summary: Attempted 1870 tasks of which 961 didn't need to be rerun and all succeeded.
NOTE: Writing buildhistory
Summary: There were 2 WARNING messages shown.
Are these warning affect my build?