TypeError [ERR_UNKNOWN_ENCODING]: Unknown encoding: null

I'm getting this error, I'm not sure if it's a problem with me or my jar file. I can't modify the file since it's downloaded from internet...

import JVM from "node-jvm";
import path from "path";

export class ServerJVM {
  #jvm;
  #entryPointClassName;

  constructor() {
    this.#jvm = new JVM();
    this.#jvm.setLogLevel(7);
    console.log(path.resolve("./server/server.jar"));
    this.#entryPointClassName = this.#jvm.loadJarFile(path.resolve("./server/server.jar"), "UTF-8");
    this.#jvm.setEntryPointClassName(this.#entryPointClassName);
  }

  async startServer({ onExit }) {
    this.#jvm.on("exit", function (code) {
      onExit(code);
    });
    this.#jvm.run([15]);
  }
}

node:internal/errors:496
    ErrorCaptureStackTrace(err);
    ^

TypeError [ERR_UNKNOWN_ENCODING]: Unknown encoding: null
    at new NodeError (node:internal/errors:405:5)
    at Buffer.toString (node:buffer:863:11)
    at Reader.readString (C:\Users\liamc\Programming\Javascript\mcm\puppet\node_modules\node-jvm\libs\util\reader.js:34:27)
    at getClassImage (C:\Users\liamc\Programming\Javascript\mcm\puppet\node_modules\node-jvm\libs\classfile\classarea.js:172:36)
    at new module.exports (C:\Users\liamc\Programming\Javascript\mcm\puppet\node_modules\node-jvm\libs\classfile\classarea.js:15:27)
    at Classes.loadClassBytes (C:\Users\liamc\Programming\Javascript\mcm\puppet\node_modules\node-jvm\libs\classes.js:47:21)
    at C:\Users\liamc\Programming\Javascript\mcm\puppet\node_modules\node-jvm\libs\classes.js:86:22
    at Array.forEach (<anonymous>)
    at Classes.loadJarFile (C:\Users\liamc\Programming\Javascript\mcm\puppet\node_modules\node-jvm\libs\classes.js:82:16)
    at JVM.loadJarFile (C:\Users\liamc\Programming\Javascript\mcm\puppet\node_modules\node-jvm\libs\jvm.js:81:20) {
  code: 'ERR_UNKNOWN_ENCODING'
}

Node.js v18.18.2

YaroslavGaponov / node-jvm

TypeError [ERR_UNKNOWN_ENCODING]: Unknown encoding: null #39