NullReference OpenCv

Hey, im working with this script but getting hundreds of errors. May someone please help me?

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using OpenCvSharp;
 
 
 public class FaceDetector : MonoBehaviour
 {
     public int Camera;
     WebCamTexture _webCamTexture;
     CascadeClassifier cascade;
     // Start is called before the first frame update
     void Start()
     {
         WebCamDevice[] devices = WebCamTexture.devices;
         _webCamTexture = new WebCamTexture(devices[1].name);
         _webCamTexture.Play();
         cascade = new CascadeClassifier(Application.dataPath + @"haarcascade_frontalface_default.xml");
     }
 
     // Update is called once per frame
     void Update()
     {
         GetComponent<Renderer>().material.mainTexture = _webCamTexture;
         Mat frame = OpenCvSharp.Unity.TextureToMat(_webCamTexture);
 
 
         findNewFace(frame);
     }
 
     void findNewFace(Mat frame)
     {
         var faces = cascade.DetectMultiScale(frame, 1.1, 2, HaarDetectionType.ScaleImage);
 
         if (faces.Length >= 1)
         {
             Debug.Log(faces[1].Location);
 
         }
     }
 }
 

FileNotFoundException: "C:/Users/finn0/Doodle Dude/Assetshaarcascade_frontalface_default.xml"not found OpenCvSharp.CascadeClassifier..ctor (System.String fileName) (at Assets/Asset/OpenCV/OpenCV+Unity/Assets/Scripts/OpenCvSharp/modules/objdetect/CascadeClassifier.cs:40) FaceDetector.Start () (at Assets/Scripts/FaceDetector.cs:18)

NullReferenceException: Object reference not set to an instance of an object FaceDetector.findNewFace (OpenCvSharp.Mat frame) (at Assets/Scripts/FaceDetector.cs:33) FaceDetector.Update () (at Assets/Scripts/FaceDetector.cs:28)