i get a error identifier not found

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Xamarin

hi
im getting this error "No resource identifier foua=nd for attribute "innerRaduisRatio in package 'android' . heres my code

<?xml version="1.0" encoding="UTF-8" ?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
  android:pivotX="50%" android:pivotY="50%" android:fromDegrees="8"
 	android:toDegrees="360">
 	<shape android:shape="ring" android:innerRaduisRatio="3"
 		   android:thicknessRatio="8" android:useLevel="false">

    <size android:width="76dip" android:height="76dip"/>

    <gradient android:type="sweep" android:useLevel="false"
            android:startColor="#F57847"
            android:angle="0"
            android:endColor="#E67E55" />

   </shape>
 </rotate>

thanks in advance