Error reported when use fetchPackwizModpack: LexerNoViableAltException('<')

[luochen1990]

Here is my code

let
    modpack = pkgs.fetchPackwizModpack {
      url = "https://github.com/luochen1990/minecraft-together-modpack/blob/packwiz/pack.toml";
      packHash = "";
    };
in {
    services.minecraft-servers = {
      enable = true;
      eula = true;
      servers."together" = {
        enable = true;
        autoStart = true;
        package = pkgs.fabricServers.fabric-1_21_1;
        symlinks = {
          "mods" = "${modpack}/mods";
        };
        # DOC: https://minecraft.wiki/w/Server.properties
        serverProperties = {
          server-port = 25565;
        };
        jvmOpts = "-Xms1024M -Xmx8192M";
      };
    };
}

And I got:

warning: found empty hash, assuming 'sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA='
evaluation warning: The type `types.string` is deprecated. See https://github.com/NixOS/nixpkgs/pull/66346 for better alternative types.
error: builder for '/nix/store/vw57q788yvwrm7mc0sd404a0vy54k77g-packwiz-pack-.drv' failed with exit code 1;
last 25 log lines:
>  at org.antlr.v4.runtime.Lexer.nextToken(SourceFile:144)
>        at org.antlr.v4.runtime.BufferedTokenStream.fetch(SourceFile:169)
>      at org.antlr.v4.runtime.BufferedTokenStream.sync(SourceFile:152)
>       at org.antlr.v4.runtime.BufferedTokenStream.consume(SourceFile:136)
>    at org.antlr.v4.runtime.Parser.consume(SourceFile:570)
>         at org.antlr.v4.runtime.Parser.match(SourceFile:204)
>   at cc.ekblad.toml.parser.TomlParser.document(SourceFile:151)
>   at cc.ekblad.toml.serialization.TomlDeserializerKt.from(SourceFile:49)
>         at cc.ekblad.toml.serialization.TomlDeserializerKt.from(SourceFile:28)
>         at link.infra.packwiz.installer.UpdateManager.start(SourceFile:489)
>    at link.infra.packwiz.installer.UpdateManager.<init>(SourceFile:42)
>    at link.infra.packwiz.installer.Main.startup(SourceFile:112)
>   at link.infra.packwiz.installer.Main.<init>(SourceFile:154)
>    at java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:62)
>         at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:502)
>         at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:486)
>   at link.infra.packwiz.installer.bootstrap.LoadJAR.start(LoadJAR.java:51)
>       at link.infra.packwiz.installer.bootstrap.Main.<init>(Main.java:73)
>    at link.infra.packwiz.installer.bootstrap.Main.main(Main.java:46)
> Caused by: LexerNoViableAltException('<')
>   at org.antlr.v4.runtime.atn.LexerATNSimulator.failOrAccept(SourceFile:309)
>     at org.antlr.v4.runtime.atn.LexerATNSimulator.execATN(SourceFile:230)
>  at org.antlr.v4.runtime.atn.LexerATNSimulator.match(SourceFile:114)
>    at org.antlr.v4.runtime.Lexer.nextToken(SourceFile:141)
>        ... 18 more
For full logs, run 'nix log /nix/store/vw57q788yvwrm7mc0sd404a0vy54k77g-packwiz-pack-.drv'.

[luochen1990]

Use raw url fixed this problem.