I have added a library in my project. However, when I use any of the views provided by the library, it gives me unbound prefix error. I have added the namespace as well in my xml file, still I am getting this error.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:wingokuFlatUI="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
 >

     <com.wingoku.flatUI.WinGokuFlatButton

        android:id="@+id/wingoku3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="wingoku"
        android:textColor="#fff"
        wingokuFlatUI:normalStateColor="#EB974E"
        wingokuFlatUI:pressedStateColor="#F2784B" />

</RelativeLayout>

UPDATE:

After making some changes, now I am getting this error

Multiple annotations found at this line:
    - error: No resource identifier found for attribute 'normalStateColor' in package
     'com.example.android_flatui_testing'
    - error: No resource identifier found for attribute 'pressedStateColor' in package
     'com.example.android_flatui_testing'

What changes can I make to the code in order to get rid of this error?

Regards

The namespace you are defining is flatUI and you are using flatui later. I think you should be using the same character casing in both the instances.