Hello friends
I get the following error that you see in the picture when I run the project
type of project : xamarin.forms
Output for operating system :xamarin.ios
Run in simulator
In iOS 11 and later, all apps use the 64-bit architecture. If your app targets an earlier version of iOS, you must update it to run on later versions. Update your project settings to support the latest version of iOS. You can't build a 64-bit project if it targets an iOS version earlier than iOS 5.1.
If above doesn't work, try selecting iOS Build -> Platform: iPone. And set the supported architectures to ARM64.
Check the doc:
https://developer.apple.com/documentation/uikit/app_and_environment/updating_your_app_from_32-bit_to_64-bit_architecture
Answers
In iOS 11 and later, all apps use the 64-bit architecture. If your app targets an earlier version of iOS, you must update it to run on later versions. Update your project settings to support the latest version of iOS. You can't build a 64-bit project if it targets an iOS version earlier than iOS 5.1.
If above doesn't work, try selecting iOS Build -> Platform: iPone. And set the supported architectures to ARM64.
Check the doc:
https://developer.apple.com/documentation/uikit/app_and_environment/updating_your_app_from_32-bit_to_64-bit_architecture
thanks for your help
I do not see ARM64 architectures in the supported architectures section and only x86_x64
How to add ARM64
Thankful
@mehrdadghasemi Right click the iOS project Properties -> iOS Build -> Platform, select iPone and set the supported architectures to ARM64. Check the screenshot:
thanks for your help

In Platform only IphoneSimulator is visible!
What's the version of the VS? Try to update the IDE to lastest statable version.
thanks for your help
I am using the latest version . VS 16.8.1