This code reproduces the problem.
Don't forget to put the image at res\drawable

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
           
            createChart();
            testLoadImage();
        }

       private TChart tChart1;
       private void createChart() {
          LinearLayout layout = (LinearLayout) findViewById(R.id.chart_layout1);
          tChart1 = new TChart(this);
          layout.addView(tChart1);
       }

       private void testLoadImage() {
          
          tChart1.getAspect().setView3D(false);
          
          Bitmap bitmapLogo = BitmapFactory.decodeResource(
                getApplicationContext().getResources(),
                R.drawable.health_regions_chart);
          
          tChart1.getWalls().getBack().getBrush().setImage(new Image(bitmapLogo));
       }