Using OpenFilePanel at runtime to open a file as a TextAsset to read data is giving NullReferenceException

I am trying to open a csv file using the OpenFile Dialog window which I will convert to a TextAsset and then Split accordingly to read the data, but it keeps giving me a NullReferenceException.

 NullReferenceException: Object reference not set to an instance of an object
 CsvNameSpace.CsvReader+<SetAngles>d__34.MoveNext () (at Assets/CsvReader.cs:92)
 UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) (at C:/buildslave/unity/build/Runtime/Export/Coroutines.cs:17)
 UnityEngine.MonoBehaviour:StartCoroutine(IEnumerator)
 CsvNameSpace.CsvReader:Update() (at Assets/CsvReader.cs:80)
 
 

Here is my code:

 using System.Collections;
 using System.IO;
 using System.Text;
 using UnityEditor;
 using UnityEngine;
 using UnityEngine.SceneManagement;
 using UnityEngine.UI;
 
 namespace CsvNameSpace {
 
 
     public class CsvReader : MonoBehaviour
     {
         
 
 
         public string[] fieldsNext;
         public string[] fields;
         public TextAsset csvFile;
         public Button record;
         public GameObject rWrist;
         public GameObject rPalm;
         public GameObject indexMeta;
         public GameObject thumbMeta;
         public GameObject middleMeta;
         public GameObject ringMeta;
         public GameObject pinkyMeta;
         public GameObject index_1;
         public GameObject index_2;
         public GameObject index_3;
         public GameObject indexEnd;
         public GameObject thumb_1;
         public GameObject thumb_2;
         public GameObject thumbEnd;
         public GameObject middle_1;
         public GameObject middle_2;
         public GameObject middle_3;
         public GameObject middleEnd;
         public GameObject ring_1;
         public GameObject ring_2;
         public GameObject ring_3;
         public GameObject ringEnd;
         public GameObject pinky_1;
         public GameObject pinky_2;
         public GameObject pinky_3;
         public GameObject pinkyEnd;
 
         // Update is called once per frame
         int i = 0;
         long previoustime = 0;
 
         void Start()
         {
             record.onClick.AddListener(ChangeScene);
             
             //open file dialog
             var path = EditorUtility.OpenFilePanel("", "","CSV");
             if (path == "")
             {
                 //if no file is chosen then change back to recording scene
                 ChangeScene();
             }
             else
             {
                 StreamReader file = new StreamReader(path);
                 //load file as a TextAsset
                 csvFile = Resources.Load(path) as TextAsset;
                 Debug.Log(path);
             }
         }
 
         void Update()
         {
                 StartCoroutine(SetAngles());
                 i++;
             
         }
 
        
         IEnumerator SetAngles()
         {
             print("Time " + Time.time);
             if (i > 0)
             {
                 //put CSV file into array called records by obtaining each row
                 string[] records = csvFile.text.Split('\n');
       //ERROR OCCURS HERE ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^