Android: HighCharts not showing up?

I'm trying to implement a multiple series line chart in HighCharts android with x-axis containing months (eg. 'Jan','Feb') and values on y-axis(avg_iex,pxil values etc.). I have implemented other charts with similar approach but this chart is not showing up. I've tried using static data on which the chart shows when code is written outside of StringRequest scope. Although, log result shows:

'MONPR'[3.58, 4.6, 7.95, 9.52, 6.81, 6.88, 5.5, 5.43, 5.87, 3.96, 4.8, 5.58].

It shows correct value like it should.

Following is the code:

        HIChartView monprchart = findViewById(R.id.monprchart); 
        HIOptions options = new HIOptions();
       
        HIChart chart = new HIChart();
        chart.setType("line");  // Use 'line' for step line chart
        options.setChart(chart);

        HITitle title = new HITitle();
        title.setText("Volume (MW)");
        HICSSObject style = new HICSSObject();
        style.setFontSize("15px");
        title.setStyle(style);
        options.setTitle(title);

        StringRequest stringRequest = new StringRequest(Request.Method.POST, URL_MONPRCHART,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {

                        try {
                            JSONObject jsonObject = new JSONObject(response);
                            String success = jsonObject.getString("status");
                            final JSONArray jsonArray1 = jsonObject.getJSONArray("price_mmr");
//                            Log.v("Data_", String.valueOf(jsonArray1));
                            if (success.equals("true")) {

                                List<String> block_time = new ArrayList<>();
                                List<Number> avg_iex_price = new ArrayList<>();
                                List<Number> avg_pxil_price = new ArrayList<>();
                                List<Number> avg_traders_price = new ArrayList<>();
                                List<Number> avg_ui_price = new ArrayList<>();


                                for (int i = 0; i < jsonArray1.length(); i++) {
                                    JSONObject object1 = jsonArray1.getJSONObject(i);

                                    block_time.add(object1.getString("block_time"));
                                    avg_iex_price.add(parseNumber(object1.optString("avg_iex_price", "0")));
                                    avg_pxil_price.add(parseNumber(object1.optString("avg_pxil_price", "0")));
                                    avg_traders_price.add(parseNumber(object1.optString("avg_traders_price", "0")));
                                    avg_ui_price.add(parseNumber(object1.optString("avg_ui_price", "0")));
                                }

                                // 3. X-Axis (e.g., categories or time)
                                HIXAxis xAxis = new HIXAxis();
                                xAxis.setCategories(new ArrayList<>(block_time)); // Example
                                options.setXAxis(new ArrayList<>(Collections.singletonList(xAxis)));

                                Log.d("MONPR",avg_iex_price.toString());

                                HIYAxis yAxis = new HIYAxis();
                                HITitle yTitle = new HITitle();
                                yTitle.setText("");
                                yAxis.setTitle(yTitle);
                                options.setYAxis(new ArrayList<>(Collections.singletonList(yAxis)));

                                // 5. Create multiple step line series
                                List<HISeries> seriesList = new ArrayList<>();

                                HILine series1 = new HILine();
                                series1.setName("Avg. IEX");
                                series1.setData(new ArrayList<>(avg_iex_price));
//                                series1.setStep("left");
                                series1.setColor(HIColor.initWithHexValue("007bff"));
                                seriesList.add(series1);

                                HILine series2 = new HILine();
                                series2.setName("Avg. PXIL");
                                series2.setData(new ArrayList<>(avg_pxil_price));
//                                series2.setStep("left");
                                series2.setColor(HIColor.initWithHexValue("28a745"));
                                seriesList.add(series2);

                                options.setSeries(new ArrayList<>(seriesList));

                               
                                monprchart.setOptions(options);//monprchart chart id
                                monprchart.reload();
                            }
                        } catch (Exception e) {
                            e.printStackTrace();
                        }


                    }
                }

API response is:

 "status": true,
    "price_mmr": [
        {
            "block_time1": "2024-01-01",
            "block_time": "Jan",
            "max_iex_price": "10.00",
            "max_pxil_price": "10.00",
            "max_traders_price": "8.63",
            "max_ui_price": "10.00",
            "avg_iex_price": "6.03",
            "avg_pxil_price": "9.50",
            "avg_traders_price": "6.66",
            "avg_ui_price": "6.28",
            "min_iex_price": "1.87",
            "min_pxil_price": "9.50",
            "min_traders_price": "4.27",
            "min_ui_price": "2.00"
        }]

P.S: 'HIOptions not attached. Chart won't render without options. Uncaught ReferenceError: Highcharts is not defined' error is showing up in the Logcat.