It was working fine on the development with the status of 200 but its giving 500 error on the deployed app

here is the route for the api

import fs from "fs";
import path from "path";


export async function GET(request: Request) {
  const ip =
    request.headers.get("x-forwarded-for") || request.headers.get("x-real-ip");

  if (!ip) {
    console.error("Unable to get IP address");
    return;
  }

  const filePath = path.join(process.cwd(), "ip_addresses.txt");
  let content = fs.existsSync(filePath)
    ? fs.readFileSync(filePath, "utf-8")
    : "";
  const lines = content.split("\n").filter((line) => line.trim() !== "");

  const ipIndex = lines.findIndex((line) => line.includes(ip));

  if (ipIndex !== -1) {
    const parts = lines[ipIndex].split("|");
    const serialNumber = parts[0].trim();
    const existingCount = parseInt(parts[1].trim().split(":")[1], 10);
    const newCount = existingCount + 1;
    const newLine = `${serialNumber}. IP: ${ip} | Count: ${newCount}`;
    lines[ipIndex] = newLine;
  } else {
    const newLine = `${lines.length + 1}. IP: ${ip} | Count: 1`;
    lines.push(newLine);
  }

  content = lines.join("\n");
  fs.writeFileSync(filePath, content);
  console.log(`IP address ${ip} logged`);

  return new Response(`IP address ${ip} logged.`);
}

this is where i am using the api

"use client";

import { useEffect } from "react";

export default function IPLogger() {
  useEffect(() => {
    const logIP = async () => {
      try {
        const response = await fetch("/api/test", {
          method: "GET",
          headers: {
            "Content-Type": "application/json",
          },
        });

        if (!response.ok) {
          throw new Error(`Error logging IP: ${response.statusText}`);
        }
      } catch (error) {
        console.error("Error logging IP:", error);
      }
    };

    logIP();
  }, []);

  return null;
}

please help me out