Why doesn't SplashScreen work?

Question

phonegap

In config.xml I write this:

<preference name="AutoHideSplashScreen" value="true" />
<preference name="SplashScreenDelay" value="3000" />

<plugin name="cordova-plugin-splashscreen" source="npm" spec="~3.2.1" />

<platform name="android">
        <splash src="icon/splash.jpg" />
</platform>

<platform name="ios">
        <splash src="icon/splash.jpg" />
</platform>

Where is the mistake?