title: Style attribute 'android:attr/colorControlNormal>' not found - cannot find mistake in source code
body: <p>I have an error : error: style attribute 'android:attr/colorControlNormal>' not found.</p>
  
  <p>There you have activity_main :</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context=".MainActivity"&gt;
  
  
  &lt;RelativeLayout
      android:layout_centerInParent="true"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"&gt;
  
      &lt;LinearLayout
          android:id="@+id/section_convert"
          android:orientation="horizontal"
          android:layout_centerHorizontal="true"
          android:layout_width="match_parent"
          android:layout_height="150dp"
          &gt;
  
          &lt;RadioGroup
              android:id="@+id/radioGroup"
              android:orientation="horizontal"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"&gt;
  
              &lt;RadioButton
                  android:id="@+id/coin2coin"
                  android:text="Coin To Coin"
                  android:theme="@style/MyRadioButton"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content" /&gt;
  
              &lt;RadioButton
                  android:id="@+id/money2coin"
                  android:text="Money To Coin"
                  android:theme="@style/MyRadioButton"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content" /&gt;
  
              &lt;RadioButton
                  android:id="@+id/coin2money"
                  android:text="Coin To Money"
                  android:theme="@style/MyRadioButton"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content" /&gt;
  
          &lt;/RadioGroup&gt;
  
  
      &lt;/LinearLayout&gt;
  
      &lt;LinearLayout
          android:layout_below="@id/section_convert"
          android:id="@+id/section_text"
          android:orientation="vertical"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"&gt;
  
          &lt;TextView
              android:text="From"
              android:textSize="16sp"
              android:textColor="@color/colorAccent"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content" /&gt;
  
          &lt;com.jaredrummler.materialspinner.MaterialSpinner
              android:id="@+id/fromSpiner"
              android:layout_marginLeft="16dp"
              android:layout_marginRight="16dp"
              app:ms_background_color="@color/colorPrimary"
              app:ms_text_color="@color/colorAccent"
              android:layout_width="match_parent"
              android:layout_height="wrap_content" /&gt;
  
          &lt;TextView
              android:text="To"
              android:textSize="16sp"
              android:textColor="@color/colorAccent"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content" /&gt;
  
          &lt;com.jaredrummler.materialspinner.MaterialSpinner
              android:id="@+id/toSpinner"
              android:layout_marginLeft="16dp"
              android:layout_marginRight="16dp"
              app:ms_background_color="@color/colorPrimary"
              app:ms_text_color="@color/colorAccent"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"/&gt;
  
      &lt;/LinearLayout&gt;
  
      &lt;Button
          android:id="@+id/btnConvert"
          android:text="CONVERT"
          android:layout_below="@id/section_text"
          android:layout_width="match_parent"
          android:layout_height="wrap_content" /&gt;
  
      &lt;android.support.v7.widget.CardView
          android:layout_below="@id/btnConvert"
          android:layout_margin="16dp"
          app:cardElevation="4dp"
          android:padding="8dp"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"&gt;
  
          &lt;LinearLayout
              android:weightSum="10"
              android:orientation="horizontal"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"&gt;
  
              &lt;ImageView
                  android:id="@+id/coinImage"
                  android:layout_weight="1"
                  android:layout_width="0dp"
                  android:layout_height="50dp" /&gt;
  
              &lt;TextView
                  android:textSize="20sp"
                  android:textColor="@color/colorAccent"
                  android:layout_weight="9"
                  android:layout_gravity="center_vertical"
                  android:layout_width="0sp"
                  android:layout_height="wrap_content"
                  /&gt;
  
          &lt;/LinearLayout&gt;
  
  
      &lt;/android.support.v7.widget.CardView&gt;
  
  
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p></p>
  
  <p>styles.xml</p>
  
  <pre><code>&lt;resources&gt;
  
      &lt;!-- Base application theme. --&gt;
      &lt;style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar"&gt;
          &lt;!-- Customize your theme here. --&gt;
          &lt;item name="colorPrimary"&gt;@color/colorPrimary&lt;/item&gt;
          &lt;item name="colorPrimaryDark"&gt;@color/colorPrimaryDark&lt;/item&gt;
          &lt;item name="colorAccent"&gt;@color/colorAccent&lt;/item&gt;
      &lt;/style&gt;
  
      &lt;style name="MyRadioButton" parent="Theme.AppCompat.Light"&gt;
          &lt;!-- there i got a message : "cannot resolve a symbol ---&gt; 
          &lt;item name="android:colorControlNormal&gt;"&gt;@color/colorPrimary&lt;/item&gt;
          &lt;item name="android:colorControlActivated"&gt;@color/colorAccent&lt;/item&gt;
      &lt;/style&gt;
  
  &lt;/resources&gt;
  </code></pre>
  
  <p>I have no idea what I'm doing wrong.
  It worked fine until i added "Convert" Button but even if I remove that program still doesn't work.
  If you need more code just let me know but i think what I put is neccesary.</p>