Boolean android.graphics.bitmap.compress(android.graphics.bitmap$compressformat, int, java.io.outputstream)' on a null object reference

<pre>@Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode==0&& resultCode==RESULT_OK)
        {

                Uri uri = data.getData();
            String [] filePathColumn = {MediaStore.Images.Media.DATA};
            Cursor cursor = getContentResolver().query(uri,filePathColumn,null,null,null);
            cursor.moveToFirst();

            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            String picturePath = cursor.getString(columnIndex);
            cursor.close();
            ByteArrayOutputStream bao = new ByteArrayOutputStream();
            bitmap = BitmapFactory.decodeFile(picturePath);

            imageArray = bao.toByteArray();
            bitmap.compress(Bitmap.CompressFormat.JPEG,100,bao);
            imageView.setImageBitmap(bitmap);
        }else {
            Toast.makeText(this, "Something wrong !", Toast.LENGTH_SHORT).show();
        }
    }

E/BitmapFactory: Unable to decode stream: java.io.FileNotFoundException: _data (No such file or directory)
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.noteapplication, PID: 7085
    java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=0, result=-1, data=Intent { dat=content://com.android.providers.media.documents/document/image:62 flg=0x1 }} to activity {com.example.noteapplication/com.example.input_show.InputActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference
        at android.app.ActivityThread.deliverResults(ActivityThread.java:4053)
        at android.app.ActivityThread.handleSendResult(ActivityThread.java:4096)
        at android.app.ActivityThread.-wrap20(ActivityThread.java)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1516)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6077)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference
        at com.example.input_show.InputActivity.onActivityResult(InputActivity.java:107)