I changed.
pacman -Syu
(1184/1184) checking keys in keyring [######################] 100%
downloading required keys...
:: Import PGP key 9D4C5AA15426DA0A, "Frederik Schwan <freswa@archlinux.org>"? [Y/n] Y
:: Import PGP key 94657AB20F2A092B, "Andreas Radke <andyrtr@archlinux.org>"? [Y/n] y
:: Import PGP key C06086337C50773E, "Jelle van der Waa <jelle@archlinux.org>"? [Y/n] y
error: required key missing from keyring
error: failed to commit transaction (unexpected error)
Errors occurred, no packages were upgraded.
Moderator edit: In the future, please use proper formatting: [HowTo] Post command output and file content as formatted text