MongoError: Document must be a valid JavaScript object - node.js

Question

I have a problem where MongoDB says that my object is not a valid JavaScript Object, Even though it is! This has been staying for days!
Basically, this is an account system that uses MongoDB's client, and the ObjectId for the ID.
I want to be able to fix the MongoError that says object (sent to updateOne, not filter) is not a valid JavaScript object.
Here is the code:
const { MongoClient, ObjectId } = require("mongodb");
const fs = require("node:fs");
const uri = "mongodb://127.0.0.1:27017";
if (!fs.existsSync("./db")) {fs.mkdirSync("./db")};
const client = new MongoClient(uri,{ useUnifiedTopology: true });
async function conn() {
await client.connect();
}
conn();
const database = client.db("login");
const accs = database.collection("accounts");
const myfil = {
_id: new ObjectId('63b6441832087ccc7e3edea2')
};
const users = accs.findOne(myfil);
const path = require("node:path");
const bcrypt = require('bcrypt');
const env = process.env;
var saltRounds = 10;
const AddSet = class AddSet {
constructor(user,pass) {
console.log(pass);
this.set = {[user]:pass};
this.set = Object.keys(this.set).reduce((acc, key) => {
acc[key.toString()] = this.set[key];
return acc;
}, {});
console.log(this.set);
return this.set;
}
}
const Account = class Account {
constructor(user,password) {
conn();
if (!users[user]) {
conn();
accs.updateOne(myfil,bcrypt.hash(password, saltRounds, function(err, hash)
{
try {
var a = ""+user;
return new AddSet(a.toString(),hash);
} catch(err) {
console.error("bcrypt",err);
}
}));
this.assetDir = path.join(path.join(env.SAVED_FOLDER,"/"+this.user),"/assets");
this.metaDir = this.assetDir + '/meta';
this.starterDir = path.join(path.join(env.SAVED_FOLDER,"/"+this.user),"/starters");
this.videoDir = path.join(path.join(env.SAVED_FOLDER,"/"+this.user),"/videos");
var fs = require('fs');
if (!fs.existsSync(this.assetDir)) fs.mkdirSync(this.assetDir, { recursive: true });
if (!fs.existsSync(this.starterDir)) fs.mkdirSync(this.assetDir, { recursive: true });
if (!fs.existsSync(this.videoDir)) fs.mkdirSync(this.assetDir, { recursive: true });
}
}
getAssetDir() {
return this.assetDir;
}
getStarterDir() {
return this.starterDir;
}
getVideoDir() {
return this.videoDir;
}
getMetaDir() {
return this.metaDir;
}
checkSession(pswd) {
conn();
bcrypt.compare(pswd, users[this.user], function(err, result) {
if (result) return true;
else return false;
});
}
}
module.exports = { Account, users };
I tried fixing it, making the keys strings, removing the $set, and it did not work.