Android Studio does not find color style resource

Question

I'm trying to use a custom with Theme.AppCompat.NoActionBar but the IDE throws the error that the named resources cannot be found. Kindly assist.Any help would be greatly appreciated.

The styles.xml is as follows:

<?xml version="1.0" encoding="utf-8"?>

<resources>
    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.NoActionBar">
        <!-- Customize your theme here. -->
        <item name="android:windowActionBar">false</item>
        <item name="android:windowActionBarOverlay">true</item>
        <item name="colorPrimary">@color/primary</item>
        <item name="colorPrimaryDark">@color/primary_dark</item>
        <item name="colorPrimaryLight">@color/primary_light</item>
        <item name="colorAccent">@color/accent</item>
        <item name="textColorPrimary">@color/primary_text</item>
        <item name="textColorSecondary">@color/secondary_text</item>
        <item name="iconColor">@color/icons</item>
        <item name="dividerColor">@color/divider</item>
    </style>    
</resources>

The colors.xml is as follows:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="primary">#FF9800</color>
    <color name="primary_dark">#F57C00</color>
    <color name="primary_light">#FFE0B2</color>
    <color name="accent">#03A9F4</color>
    <color name="primary_text">#212121</color>
    <color name="secondary_text">#727272</color>
    <color name="icons">#212121</color>
    <color name="divider">#B6B6B6</color>
</resources>

Answer 1

Just Build > Clean Project Then File > Invalidate Caches / Restart Project.

Answer 2

Rename Your xml Name, Set color.xml instead colors.xml under values folder. Then Build > Clean Project Then Restart Project .

Or try this way

 <resources xmlns:android="http://schemas.android.com/apk/res/android">
<color name="green">#00ff00</color>

Reference