Self-hosted Function error v.1.5.4

TypeError: userFunction is not a function
    at execute (/usr/local/server/src/server.js:159:28)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async action (/usr/local/server/src/server.js:174:13)
    at async /usr/local/server/src/server.js:10:9

{
  "name": "api",
  "version": "1.0.0",
  "description": "",
  "main": "src/index.js",
  "type": "module",
  "scripts": {
    "start": "node src/index",
    "dev": "nodemon src/index"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "@fastify/cors": "^8.5.0",
    "@fastify/websocket": "^8.3.1",
    "appwrite": "^14.0.0",
    "dotenv": "^16.4.5",
    "fastify": "^4.25.2",
    "is-mobile": "^4.0.0",
    "jsonwebtoken": "^9.0.2",
    "mobile-device-detect": "^0.4.3",
    "node-appwrite": "^12.0.1",
    "node-steam-openid": "^1.2.3",
    "nodemon": "^3.0.2",
    "passport-steam": "^1.0.18",
    "useragent": "^2.3.0"
  }
}```

import Fastify from "fastify";
import web from "./api/auth/web.js";
import app from "./api/auth/app.js";
import { config } from "dotenv";

config()

const fastify = Fastify({
  logger: true,
});


fastify.register(web, { prefix: "/auth/web/" });
fastify.register(app, { prefix: "/auth/app/" });

try {
  await fastify.listen({ host: "0.0.0.0", port: 1009 });
} catch (err) {
  fastify.log.error(err);
  process.exit(1);
}