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<application
android:icon="@mipmap/ic_launcher"
android:name="${applicationName}"
android:label="PassesBox"
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Change:
<application
android:icon="@mipmap/ic_launcher"
android:name="io.flutter.app.FlutterApplication"
android:label="PassesBox"
To:
<application
android:icon="@mipmap/ic_launcher"
android:name="${applicationName}"
android:label="PassesBox"