My Xamarin.ios BLE example "How to communicate with Bluetooth Low Energy devices on iOS" crashes

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I get a crash when I run the example code for a Bluetooth Low Energy app for Xamarin.ios
from blog "How to communicate with Bluetooth Low Energy devices on iOS" at:
https://wojciechkulik.pl/xamarin-ios/how-to-communicate-with-bluetooth-low-energy-devices-on-ios

enter image description here

The zip for his example code is at:
https://github.com/wojciech-kulik/Sample-Projects

The only think I changed was to add his recommended NSBluetoothPeripheralUsageDescription fix to my info.plist here…………….

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>CFBundleName</key>
    <string>BluetoothTest</string>
    <key>CFBundleIdentifier</key>
    <string>pl.wojciechkulik.BluetoothTest</string>
    <key>CFBundleShortVersionString</key>
    <string>1.0</string>
    <key>CFBundleVersion</key>
    <string>1.0</string>
    <key>LSRequiresIPhoneOS</key>
    <true/>
    <key>MinimumOSVersion</key>
    <string>9.3</string>
    <key>UIDeviceFamily</key>
    <array>
        <integer>1</integer>
    </array>
    <key>UILaunchStoryboardName</key>
    <string>LaunchScreen</string>
    <key>UIMainStoryboardFile</key>
    <string>Main</string>
    <key>UIRequiredDeviceCapabilities</key>
    <array>
        <string>armv7</string>
    </array>
    <key>UISupportedInterfaceOrientations</key>
    <array>
        <string>UIInterfaceOrientationPortrait</string>
        <string>UIInterfaceOrientationLandscapeLeft</string>
        <string>UIInterfaceOrientationLandscapeRight</string>
    </array>
    <key>XSAppIconAssets</key>
    <string>Assets.xcassets/AppIcon.appiconset</string>
    <key>UIBackgroundModes</key>
    <array>
        <!--for connecting to devices (client)-->
        <string>bluetooth-central</string>

        <!--for server configurations if needed-->
        <string>bluetooth-peripheral</string>
    </array>

    <!--Description of the Bluetooth request message (required on iOS 10, deprecated)-->
    <key>NSBluetoothPeripheralUsageDescription</key>
    <string>YOUR CUSTOM MESSAGE</string>

    <!--Description of the Bluetooth request message (required on iOS 13)-->
    <key>NSBluetoothAlwaysUsageDescription</key>
    <string>YOUR CUSTOM MESSAGE</string></dict>
</plist>

Source: Xamarin.ios Questions

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