Leaked window error using Material Dialog Compact (Alert Dialog)

I'm getting an error when i try and delete an item from a listview using material dialog compact. Here is the error message below. Any help would be appreciated. I'm new to Java so my experience with debugging is poor.

03-02 17:11:38.194  30222-30222/com.m4tchb0x87.rhinote E/WindowManager﹕ android.view.WindowLeaked: Activity com.m4tchb0x87.rhinote.ReadNoteMenu has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{42a9a7a8 V.E..... R....... 0,0-1061,428} that was originally added here
            at android.view.ViewRootImpl.<init>(ViewRootImpl.java)
            at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java)
            at android.view.WindowManagerImpl.addView(WindowManagerImpl.java)
            at android.app.Dialog.show(Dialog.java:289)
            at com.afollestad.materialdialogs.MaterialDialog.show(MaterialDialog.java:1464)
            at com.afollestad.materialdialogs.MaterialDialogCompat$Builder.show(MaterialDialogCompat.java:148)
            at com.m4tchb0x87.rhinote.ReadNoteMenu$2.onItemLongClick(ReadNoteMenu.java:172)
            at android.widget.AbsListView.performLongPress(AbsListView.java)
            at android.widget.AbsListView$CheckForLongPress.run(AbsListView.java)
            at android.os.Handler.handleCallback(Handler.java)
            at android.os.Handler.dispatchMessage(Handler.java)
            at android.os.Looper.loop(Looper.java)
            at android.app.ActivityThread.main(ActivityThread.java:5579)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java)
            at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:132)
            at dalvik.system.NativeStart.main(Native Method)

My code:

public class ReadNoteMenu extends ActionBarActivity {



    public static final String EXTRA_MESSAGE = "com.m4tchb0x87.rhinote.MESSAGE";

    Context context;

    public ReadNoteMenu() {

        this.context = this;
    }

    ArrayAdapter mArrayAdapter;
    ListView listView;


    protected void onCreate(Bundle bundle) {
        super.onCreate(bundle);
        this.setContentView(R.layout.activity_read_note_menu);

        ActionBar actionBar = getSupportActionBar();
        actionBar.setDisplayHomeAsUpEnabled(true);

        listView = (ListView) this.findViewById(R.id.readListView);
        String fileNames[] = new File(String.valueOf(Environment.getExternalStorageDirectory().getAbsolutePath()) + "/Rhinote").list();
        mArrayAdapter = new ArrayAdapter<>(this, R.layout.list_item_1, fileNames);
        listView.setAdapter(mArrayAdapter);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            public void onItemClick(AdapterView adapterView, View view, int i, long l) {
                String string = (String) listView.getItemAtPosition(i);
                Intent intent = new Intent(ReadNoteMenu.this, (Class) ReadNote.class);
                intent.putExtra(EXTRA_MESSAGE, string);
                ReadNoteMenu.this.startActivity(intent);
            }
        });

        listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {


            public boolean onItemLongClick(AdapterView adapterView, View view, final int position, long l) {




                ContextThemeWrapper CTW = new ContextThemeWrapper( context, R.style.ADM_theme);
                final MaterialDialogCompat.Builder MDM1 = new MaterialDialogCompat.Builder(CTW);

                MDM1.setMessage("Edit or delete file?");
                MDM1.setPositiveButton("Delete", new DialogInterface.OnClickListener() {



                    public void onClick(DialogInterface dialog,  int which) {

                        ContextThemeWrapper CTW = new ContextThemeWrapper( context, R.style.ADM_theme);
                        final MaterialDialogCompat.Builder MDM2 = new MaterialDialogCompat.Builder(CTW);



                        MDM2.setMessage("Confirm delete file?");
                        MDM2.setPositiveButton("Confirm", new DialogInterface.OnClickListener() {




                        public void onClick(DialogInterface dialog, int which) {


                                String str = (String) listView.getItemAtPosition(position);
                                new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/RhiNote" + "/" + str).delete();

                                LayoutInflater inflater = getLayoutInflater();
                                View layout = inflater.inflate(R.layout.toast_custom,
                                        (ViewGroup) findViewById(R.id.toast_layout_root_0));
                                TextView text = (TextView) layout.findViewById(R.id.text_0);
                                text.setText("Note deleted!");
                                Toast toast = new Toast(getApplicationContext());
                                toast.setDuration(Toast.LENGTH_SHORT);
                                toast.setView(layout);
                                toast.show();

                                ReadNoteMenu.this.finish();
                                ReadNoteMenu.this.startActivity(ReadNoteMenu.this.getIntent());

                            }
                        });

                        MDM2.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {

                            public void onClick(DialogInterface dialog, int which) {

                                dialog.dismiss();

                            }
                        });

                        MDM2.show();


                    }

                });


                    MDM1.setNegativeButton("Edit", new DialogInterface.OnClickListener() {


                    String fileText = "";

                    public void onClick(DialogInterface dialogInterface, int which) {

                        String str1 = (String)listView.getItemAtPosition(position);
                        File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/RhiNote" + "/" + str1);


                        {
                            try {

                                Scanner scanner = new Scanner(file);
                                while (scanner.hasNextLine()) {
                                    String string = scanner.nextLine();
                                    this.fileText = String.valueOf(this.fileText) + string + "\n";
                                }
                            } catch (FileNotFoundException localFileNotFoundException) {

                                localFileNotFoundException.printStackTrace();
                            }
                                }

                            Intent intent = new Intent(ReadNoteMenu.this.context, EditNote.class);
                            intent.putExtra("TEXTBODY", fileText);
                            intent.putExtra("TEXTTITLE", str1);
                            ReadNoteMenu.this.startActivity(intent);



                        }



                });


                MDM1.show();

                MDM1.setNeutralButton("Cancel", new DialogInterface.OnClickListener() {

                    public void onClick(DialogInterface dialog, int which) {


                        dialog.dismiss();


                    }
                });

                MDM1.show();



                return true;
            }
        });
    }
}