1error:2 … while evaluating the attribute 'optionalValue.value'3 at «git+https://github.com/TUM-DSE/nixpkgs.git?ref=nixos-26.05-backports&rev=21033b66851dc248cdaaa1b1adae5a200cb1635a&shallow=1»/lib/modules.nix:1330:5:4 1329|5 1330| optionalValue = if isDefined then { value = mergedValue; } else { };6 | ^7 1331| };89 … while evaluating a branch condition10 at «git+https://github.com/TUM-DSE/nixpkgs.git?ref=nixos-26.05-backports&rev=21033b66851dc248cdaaa1b1adae5a200cb1635a&shallow=1»/lib/modules.nix:1330:21:11 1329|12 1330| optionalValue = if isDefined then { value = mergedValue; } else { };13 | ^14 1331| };1516 … while evaluating definitions from `/nix/store/xfg4bws749i95jvnxhymxmfwailzk38q-source/modules/transposition.nix':1718 … while evaluating definitions from `/nix/store/1c5ksdrp7xgfxsdapmrjz4fbz0h9hkfr-source/flake.nix, via option perSystem':1920 … while evaluating the option `system.build.toplevel':2122 … while evaluating definitions from `/nix/store/fq2fj9ycvai5pjw8qs847gl91az0dx9h-source/nixos/modules/system/activation/top-level.nix':2324 … while evaluating the option `warnings':2526 … while evaluating definitions from `/nix/store/fq2fj9ycvai5pjw8qs847gl91az0dx9h-source/nixos/modules/system/boot/systemd.nix':2728 … while evaluating the option `systemd.services.lrz-gitlab-classroom-frontend.serviceConfig':2930 … while evaluating definitions from `/nix/store/fq2fj9ycvai5pjw8qs847gl91az0dx9h-source/nixos/modules/system/boot/systemd.nix':3132 … while evaluating the option `systemd.services.lrz-gitlab-classroom-frontend.script':3334 … while evaluating definitions from `/nix/store/1c5ksdrp7xgfxsdapmrjz4fbz0h9hkfr-source/modules/lrz-gitlab-classroom/frontend.nix':3536 (stack trace truncated; use '--show-trace' to show the full, detailed trace)3738 error: Failed to open archive (Source threw exception: error: unable to download 'https://github.com/pogobanane/lrz-gitlab-classroom/archive/e8b5806b3784da7cb249539871a8f7d9be6d3a1a.tar.gz': HTTP error 4043940 response body:4142 Not Found)