java.io.FileNotFoundException: /storage/emulated/0/SAVE IMAGE EXAMPLE/myimage.png (No such file or directory)

final PieChart piechart = (PieChart) findViewById(R.id.piechart);


 button2.setOnClickListener(new View.OnClickListener() {
                                               public void onClick (View v) {
                                                   Toast.makeText(Main.this, "Chart Saved", Toast.LENGTH_SHORT).show();
                                                   piechart.setCenterText("Test");
                                                   Bitmap bitmap;
                                                   OutputStream output;

                                                   bitmap = BitmapFactory.decodeResource(getResources(),R.id.piechart);

                                                   File filepath = Environment.getExternalStorageDirectory();

                                                   File dir = new File(filepath.getAbsolutePath()+"/SAVE IMAGE EXAMPLE");
                                                   dir.mkdirs();

                                                   File file = new File(dir, "myimage.png");

                                                   try {
                                                       output = new FileOutputStream(file);

                                                       bitmap.compress(Bitmap.CompressFormat.PNG, 100, output);
                                                       output.flush();
                                                       output.close();


                                                   }catch(Exception e){
                                                       e.printStackTrace();
                                                   }

                                               }
                                           });