Android:theme error / android mode version 3

android mode version 3

Good morning. As follows
I get an error when doing AndroidManifest.xml

What should I do?

<?xml version="1.0" encoding="UTF-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="">
    <uses-sdk android:minSdkVersion="17" android:targetSdkVersion="26"/>
    <application android:icon="@drawable/icon" android:label="">
        <activity android:name=".MainActivity" android:theme="@style/Theme.AppCompat.Light.NoActionBar.FullScreen">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
        <service android:enabled="true" android:exported="false" android:name=".DummyService"/>
    </application>
</manifest>

@GWAK === your Manifest seems ok; in setup() try not using fullscreen(), which is useless because it is the default (declared by the Manifest).