wget unable to resolve host address

[TotallyNotSethP]

i got this error when running make sdk:

root@19888d62036a:~/buildroot# make sdk
/usr/bin/make -j1 O=/root/buildroot/output HOSTCC="/usr/bin/gcc" HOSTCXX="/usr/bin/g++" syncconfig
make[1]: Entering directory '/root/buildroot'
mkdir -p /root/buildroot/output/build/buildroot-config/lxdialog
PKG_CONFIG_PATH="" /usr/bin/make CC="/usr/bin/gcc" HOSTCC="/usr/bin/gcc" \
    obj=/root/buildroot/output/build/buildroot-config -C support/kconfig -f Makefile.br conf
make[2]: Entering directory '/root/buildroot/support/kconfig'
/usr/bin/gcc -I/usr/include/ncursesw -DCURSES_LOC="<curses.h>"  -DNCURSES_WIDECHAR=1 -DLOCALE  -I/root/buildroot/output/build/buildroot-config -DCONFIG_=\"\"   /root/buildroot/output/build/buildroot-config/conf.o /root/buildroot/output/build/buildroot-config/zconf.tab.o  -o /root/buildroot/output/build/buildroot-config/conf
make[2]: Leaving directory '/root/buildroot/support/kconfig'
make[1]: Leaving directory '/root/buildroot'
>>> host-skeleton  Extracting
>>> host-skeleton  Patching
>>> host-skeleton  Configuring
>>> host-skeleton  Building
>>> host-skeleton  Installing to host directory
>>> host-tar 1.29 Downloading
--2023-06-04 14:11:42--  http://ftpmirror.gnu.org/tar/tar-1.29.cpio.gz
Resolving ftpmirror.gnu.org (ftpmirror.gnu.org)... failed: Temporary failure in name resolution.
wget: unable to resolve host address 'ftpmirror.gnu.org'
--2023-06-04 14:11:42--  http://sources.buildroot.net/tar/tar-1.29.cpio.gz
Resolving sources.buildroot.net (sources.buildroot.net)... failed: Temporary failure in name resolution.
wget: unable to resolve host address 'sources.buildroot.net'
--2023-06-04 14:11:42--  http://sources.buildroot.net/tar-1.29.cpio.gz
Resolving sources.buildroot.net (sources.buildroot.net)... failed: Temporary failure in name resolution.
wget: unable to resolve host address 'sources.buildroot.net'
make: *** [package/pkg-generic.mk:160: /root/buildroot/output/build/host-tar-1.29/.stamp_downloaded] Error 1