Failed to download metadata

Hi, I get Errors during downloading metadata for repository 'rpmfusion-free-updates': - Downloading successful, but checksum doesn't match. Calculated: 99dbfed6078c06c5c8a60e0f1103f6fa5cf14155f0f56710c218e5753d532894ce3d9bb10c89564278e472eb71c81ef4e60d14d67fb778fef87102dd6ec417fc(sha512) Expected: 1273dd2e76b66bb35c38f0f20dc6f34cc179348169a004419220e44abb3b1aa4c7abb2d6b2f376a818cd4c5c24e38f37c8e568e53a18a425cfef31acab5c37ff(sha512) Error: Failed to download metadata for repo 'rpmfusion-free-updates': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried during "dnf update". What's behind? Regards, Frank