Error: m4: signature from "David Runge <dvzrv@archlinux.org>" is unknown trust

hello , I installed the new version of manjaro gnome . with linux69 .

it is giving this error -

error: m4: signature from "David Runge <dvzrv@archlinux.org>" is unknown trust
:: File /var/cache/pacman/pkg/m4-1.4.19-3-x86_64.pkg.tar.zst is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n]

I cant delete , and do any thing . I need help