Round Corner image exception

when i want to use Round-corner image library from github ( like : this ) it throws an exception , I use this Project from android developer site I just in it's Xml file chang QuickContactBadge to CircularImage and then in Circular library class it throws following exception :

Process: chaapaarim.takinsoft.ir.chaapar, PID: 23756
java.lang.ClassCastException: android.graphics.drawable.TransitionDrawable cannot be cast to android.graphics.drawable.BitmapDrawable
        at ir.takinsoft.chaapaar.im.ui.helper.RoundedImageView.onDraw(RoundedImageView.java:65)

does any body knows what's the reason ? and how can I solve this ?

Here is my XML :

    <ir.takinsoft.chaapaar.im.ui.helper.RoundedImageView
        android:id="@android:id/icon"
        android:layout_height="?android:attr/listPreferredItemHeight"
        android:layout_width="?android:attr/listPreferredItemHeight"
        android:scaleType="centerCrop"
        android:src="@drawable/ic_contact_picture_holo_light"
        />

And here is Google Sample

<QuickContactBadge android:id="@android:id/icon"
        android:layout_height="?android:attr/listPreferredItemHeight"
        android:layout_width="?android:attr/listPreferredItemHeight"
        android:scaleType="centerCrop"
        style="@style/quickContactBadgeStyle"
        android:src="@drawable/ic_contact_picture_holo_light"/>

And here is function which throws exception :

 @Override
    protected void onDraw(Canvas canvas) {
        if (((BitmapDrawable) getDrawable()) != null) {
            mBitmap = ((BitmapDrawable) getDrawable()).getBitmap();
            mBitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
        }

        paint.setAntiAlias(true);
        paint.setShader(mBitmapShader);

        mRoundRectShape.resize(getWidth(), getHeight());
        mRoundRectShape.draw(canvas, paint);
    }