Why am I getting ‘user.matchPassword is not a function’ error when calling my API with bcryptjs in Node.js and Express?

const userAuth = asyncHandler( async (req,res)=>{
    const  { email , password } = req.body;

    const user = User.findOne({email});

    if(user && (await user.matchPassword(password))){
        generateToken(res,user._id)
        res.status(201).json({
            _id:user._id,
            name:user.name,
            email:user.email
        })
       }else{
        res.status(401);
        throw new Error('Incorrect Password or Email');
        }
});

{
    "message": "user.matchPassword is not a function",
    "stack": "TypeError: user.matchPassword is not a functionn    at file:///C:/Users/siroh/OneDrive/Desktop/MERN-Auth/server/Controllers/userControllers.js:45:28n    at asyncUtilWrap (C:\Users\siroh\OneDrive\Desktop\MERN-Auth\node_modules\express-async-handler\index.js:3:20)n    at Layer.handle [as handle_request] (C:\Users\siroh\OneDrive\Desktop\MERN-Auth\node_modules\express\lib\router\layer.js:95:5)n    at next (C:\Users\siroh\OneDrive\Desktop\MERN-Auth\node_modules\express\lib\router\route.js:144:13)n    at Route.dispatch (C:\Users\siroh\OneDrive\Desktop\MERN-Auth\node_modules\express\lib\router\route.js:114:3)n    at Layer.handle [as handle_request] (C:\Users\siroh\OneDrive\Desktop\MERN-Auth\node_modules\express\lib\router\layer.js:95:5)n    at C:\Users\siroh\OneDrive\Desktop\MERN-Auth\node_modules\express\lib\router\index.js:284:15n    at Function.process_params (C:\Users\siroh\OneDrive\Desktop\MERN-Auth\node_modules\express\lib\router\index.js:346:12)n    at next (C:\Users\siroh\OneDrive\Desktop\MERN-Auth\node_modules\express\lib\router\index.js:280:10)n    at Function.handle (C:\Users\siroh\OneDrive\Desktop\MERN-Auth\node_modules\express\lib\router\index.js:175:3)"
}