Problem with Prisma

async function signUp(req: Request, res: Response) {
  req.body.password = await hashPassword(req.body.password);
  req.body.birthDate = new Date(req.body.birthDate).toISOString();
  try {
    delete req.body.repeat_password;
    const user = await User.createUser(req.body);
    res.status(200).json(user);
  } catch (error) {
    if (error instanceof PrismaClientKnownRequestError)
      res.status(400).json({ code: error.code, message: error.message });
    else if (error instanceof Error)
      res.status(400).json({
        message: error.message || "Error Signing up user",
      });
    else res.status(400).json(error);
  }
}

import { Prisma, PrismaClient } from "@prisma/client";

const prisma = new PrismaClient();
async function createUser(user: User) {
  try {
    const result = await prisma.user.create({
      data: {
        username: user.username,
        birthDate: user.birthDate,
        password: user.password,
      },
    });
    return result;
  } catch (error) {
    if (error instanceof Prisma.PrismaClientKnownRequestError) throw error;
    throw error;
  }
}

{
    "message": "\nInvalid 

 invocation in\nC:\\Users\\ghera\\OneDrive\\Desktop\\GithubRepo\\Book_Tracker\\server\\src\\models\\userModel.ts:29:38\n\n  26 \n  27 async function createUser(user: User) {\n  28   try {\n→ 29     const result = await prisma.user.create(\nerror: Environment variable not found: DATABASE_URL."
}