61.81 sfatal: unable to access 'https://gitlab.horizon-haskell.net/nix/ghc-common-hadrian/': The requested URL returned error: 504
61.82 s{"attrPath":["checks","x86_64-linux","forwardCompatibility"],"error":"error:\n … while evaluating the attribute 'horizon-advance.result'\n at «flakes-internal»/call-flake.nix:94:7:\n 93| {\n 94| result =\n | ^\n 95| if node.flake or true then\n\n … in the left operand of the update (//) operator\n at «flakes-internal»/call-flake.nix:75:9:\n 74| result =\n 75| outputs\n | ^\n 76| # We add the sourceInfo attribute for its metadata, as they are\n\n (stack trace truncated; use '--show-trace' to show the full, detailed trace)\n\n error: Failed to fetch git repository 'https://gitlab.horizon-haskell.net/nix/ghc-common-hadrian'","type":"error"}