Android : Android Studio shows error in v21/styles because of "android:" prefix

I created a new project and there wasn't a v21 folder so I created one, added the "styles" file also and now after writing my style, I'm getting an error because of the "android:" prefix.

my code:

styles :

<resources>

<!-- Base application theme. -->
<style name="AppTheme" parent="AppTheme.Base">
    <!-- Customize your theme here. -->
</style>

<style name="AppTheme.Base" parent="Theme.AppCompat.Light">
    <item name="colorPrimary">@color/maincolor</item>
    <item name="colorPrimaryDark">@color/statusbar</item>
</style>

v21/styles:

<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="AppTheme.Base">
    <!-- Customize your theme here. -->
    <item name="android:colorPrimary">@color/maincolor</item>
    <item name="android:colorPrimaryDark">@color/statusbar</item>
</style>

Android Studio marks "android:colorPrimary" and "android:colorPrimaryDark" as an error, it says "requires API level 21 (current min is 14)" The app runs but my style won't show... What am I doing wrong?