Can't retrive data from mysql using volley in recycler view

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Android

Hey I'm fetching data in Json using array in volley sql, but the error is found that data is not loading in recycler view . I'm fetching all rows which have same id. But data is not loading. here is my code can you tell me where is the error.Please help me to fix it, the data is not loading and in app it is showing json error can not covert string to json array // something like this. help me i'm very close to finish my app

What I have tried:

private void LoadAllJobs() {
    StringRequest stringRequest = new StringRequest(Request.Method.POST, Urls.all_jobs,
            new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    try {
                        JSONArray jsonArray = new JSONArray(response);
                        for (int i = 0; i < jsonArray.length(); i++) {
                            JSONObject object = jsonArray.getJSONObject(i);
                            String jobname = object.getString("jobname");
                            String jobdetails = object.getString("jobdetails");
                            String startdate = object.getString("startdate");
                            String enddate = object.getString("enddate");
                            String posts = object.getString("posts");
                            String govtfees = object.getString("govtfees");
                            String appfees = object.getString("appfees");
                            String documents = object.getString("documents");
                            String declartion = object.getString("declartion");


                            AllJobsModel alljobsName = new AllJobsModel(jobname, jobdetails, posts, startdate, enddate, govtfees, appfees, documents, declartion);
                            alljobsName.setJobName(jobname);
                            alljobsName.setJobDetails(jobdetails);
                            allJobs.add(alljobsName);


                        }
                    } catch (JSONException e) {
                        e.printStackTrace();
                        AndroidUtil.showToast(getApplicationContext(),e.toString());
                    }
                }
            }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            error.printStackTrace();
        }
    }){
        @Nullable
        @Override
        protected Map<String, String> getParams() throws AuthFailureError {
            Map<String, String> params = new HashMap<>();
            params.put("id","1");
            return params;
        }

    };
        RequestQueue queue=  Volley.newRequestQueue(MainActivity.this);
        queue.add(stringRequest);


    }

<?php

    require_once "conn.php";
    require_once "validate.php";
    $id = $_POST['id'];
    $sql = "SELECT * from all_jobs WHERE id ='$id'";
    $result=mysqli_query($conn, $sql);
    $all_jobs= array();
    while($row=mysqli_fetch_array($result)){
        
        
        $index['jobname']=$row['jobname'];
        $index['posts']=$row['posts'];
        $index['startdate']=$row['startdate'];
        $index['enddate']=$row['enddate'];
        $index['govtfees']=$row['govtfees'];
        $index['appfees']=$row['appfees'];
        $index['documents']=$row['documents'];
        $index['declartion']=$row['declartion'];
        $index['jobdetails']=$row['jobdetails'];
        

        array_push($all_jobs, $index);
    }
    echo json_encode($all_jobs)
?>