can't build flake

I cloned the repo and tried to build it with: `nix build --extra-experimental-features 'nix-command flakes' .` The error I get is: ``` warning: updating lock file "/home/capsel/projects/kickstart.nixvim/flake.lock": • Added input 'flake-parts': 'github:hercules-ci/flake-parts/758cf7296bee11f1706a574c77d072b8a7baa881?narHash=sha256-wfG0S7pltlYyZTM%2BqqlhJ7GMw2fTF4mLKCIVhLii/4M%3D' (2025-10-01) • Added input 'flake-parts/nixpkgs-lib': 'github:nix-community/nixpkgs.lib/a73b9c743612e4244d865a2fdee11865283c04e6?narHash=sha256-x2rJ%2BOvzq0sCMpgfgGaaqgBSwY%2BLST%2BWbZ6TytnT9Rk%3D' (2025-08-10) • Added input 'nixpkgs': 'github:nixos/nixpkgs/7df7ff7d8e00218376575f0acdcc5d66741351ee?narHash=sha256-gTrEEp5gEspIcCOx9PD8kMaF1iEmfBcTbO0Jag2QhQs%3D' (2025-10-02) • Added input 'nixvim': 'github:nix-community/nixvim/e45e9214dcc2ea770418fe407a43902b0438ce78?narHash=sha256-OjvEGJEZDkAri6m1oUV0DE%2BpRKqh6KEcVuCIlmLN7QU%3D' (2025-10-05) • Added input 'nixvim/flake-parts': 'github:hercules-ci/flake-parts/758cf7296bee11f1706a574c77d072b8a7baa881?narHash=sha256-wfG0S7pltlYyZTM%2BqqlhJ7GMw2fTF4mLKCIVhLii/4M%3D' (2025-10-01) • Added input 'nixvim/flake-parts/nixpkgs-lib': follows 'nixvim/nixpkgs' • Added input 'nixvim/nixpkgs': follows 'nixpkgs' • Added input 'nixvim/nuschtosSearch': 'github:NuschtOS/search/7d4c0fc4ffe3bd64e5630417162e9e04e64b27a4?narHash=sha256-igrxT%2B/MnmcftPOHEb%2BXDwAMq3Xg1Xy7kVYQaHhPlAg%3D' (2025-09-23) • Added input 'nixvim/nuschtosSearch/flake-utils': 'github:numtide/flake-utils/11707dc2f618dd54ca8739b309ec4fc024de578b?narHash=sha256-l0KFg5HjrsfsO/JpG%2Br7fRrqm12kzFHyUHqHCVpMMbI%3D' (2024-11-13) • Added input 'nixvim/nuschtosSearch/flake-utils/systems': 'github:nix-systems/default/da67096a3b9bf56a91d16901293e51ba5b49a27e?narHash=sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768%3D' (2023-04-09) • Added input 'nixvim/nuschtosSearch/ixx': 'github:NuschtOS/ixx/babfe85a876162c4acc9ab6fb4483df88fa1f281?narHash=sha256-EM0IE63OHxXCOpDHXaTyHIOk2cNvMCGPqLt/IdtVxgk%3D' (2025-08-10) • Added input 'nixvim/nuschtosSearch/ixx/flake-utils': follows 'nixvim/nuschtosSearch/flake-utils' • Added input 'nixvim/nuschtosSearch/ixx/nixpkgs': follows 'nixvim/nuschtosSearch/nixpkgs' • Added input 'nixvim/nuschtosSearch/nixpkgs': follows 'nixvim/nixpkgs' • Added input 'nixvim/systems': 'github:nix-systems/default/da67096a3b9bf56a91d16901293e51ba5b49a27e?narHash=sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768%3D' (2023-04-09) error: … while calling the 'derivationStrict' builtin at <nix/derivation-internal.nix>:37:12: 36| 37| strict = derivationStrict drvAttrs; | ^ 38| … while evaluating derivation 'nixvim' whose name attribute is located at /nix/store/9v6qa656sq3xc58vkxslqy646p0ajj61-source/pkgs/stdenv/generic/make-derivation.nix:544:13 … while evaluating attribute 'paths' of derivation 'nixvim' at /nix/store/9v6qa656sq3xc58vkxslqy646p0ajj61-source/pkgs/build-support/trivial-builders/default.nix:619:11: 618| inherit preferLocalBuild allowSubstitutes; 619| paths = mapPaths (path: "${path}${stripPrefix}") paths; | ^ 620| passAsFile = [ "paths" ]; (stack trace truncated; use '--show-trace' to show the full, detailed trace) error: atopile cannot be found in pkgs ``` I'm new to nix.