Minecraft Forge Server

error

installing
error: path '/nix/store/w6acd9pw6pbs1cbj94xmwz3hmpg80914-minecraft-forge-server-1.12.2-14.23.5.2838' is not valid

forge.nix

{ stdenv, fetchurl, jre }:

let
  version = "1.12.2-14.23.5.2838";
  forge-installer = fetchurl {
    url = "https://files.minecraftforge.net/maven/net/minecraftforge/forge/${version}/forge-${version}-installer.jar";
    sha256 = "0271lrsnbigrhq6is2pqp95cafv7i6hx6r2fnjbkv0krhp243r6d";
  };

in stdenv.mkDerivation rec {
  name = "minecraft-forge-server-${version}";

  preferLocalBuild = true;

  buildPhase = ''
    ${jre}/bin/java -jar ${forge-installer} --installServer
  '';

  installPhase = ''
    mkdir -p $out/bin $out/lib/minecraft
    rm *installer*
    cp -r * $out/lib/minecraft

    cat > $out/bin/minecraft-server << EOF
    #!/bin/sh
    exec ${jre}/bin/java $@ -jar $out/lib/minecraft/forge-${version}-universal.jar nogui
    EOF

    chmod +x $out/bin/minecraft-server
  '';

  phases = "buildPhase installPhase";

  outputHashAlgo = "sha256";
  outputHashMode = "recursive";
  outputHash = "0000000000000000000000000000000000000000000000000000000000000000";

  meta = {
    description = "Minecraft Forge Server";
    homepage    = "https://files.minecraftforge.net";
    license     = stdenv.lib.licenses.unfreeRedistributable;
    platforms   = stdenv.lib.platforms.unix;
    maintainers = with stdenv.lib.maintainers; [ lucus16 ];
  };
}