Failed to download metadata for repo ‘AppStream’ [CentOS]

Error: Failed to download metadata for repo 'AppStream’: Cannot prepare internal mirrorlist: No URLs in mirrorlist
cd /etc/yum.repos.d/
sed -i 's/mirrorlist/#mirrorlist/g’ /etc/yum.repos.d/CentOS-*
sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g’ /etc/yum.repos.d/CentOS-*
yum update -y

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