I encounter a stranger behavior with a Xamarin.Android project in Visual Studio on Windows.
I've created a new Android blank project, and I try ton install the NuGet package "AForge" (a mathematics library), but I get the following error message:
Package AForge 2.2.5 is not compatible with monoandroid81 (MonoAndroid,Version=v8.1).
I've already tried to re create several projects, after having relaunched Visual Studio and the computer, but the problem is still the same.
However, if I do the same thing on Mac, through Visual Studio for Mac, I don't encounter the same problem: the package is well installed.
In add, I can see in the package.config file, that the package il well related to monodroid81:
<?xml version="1.0" encoding="utf-8"?><packages><package id="AForge" version="2.2.5" targetFramework="monoandroid81" /></packages>Would you have any explanation about this issue?
Update: new issue
Hi @Leo Liu-MSFT, I come back to you as I encounter an new issue. The dll copy works fine locally, but I get an error on AppCenter:
CoreCompile:
/Library/Frameworks/Mono.framework/Versions/5.10.1/lib/mono/4.5/csc.exe /noconfig /nowarn:1701,1702 /nostdlib+ /errorreport:prompt /warn:4 /define:DEBUG;TRACE;XAMARIN_ANDROID_v1_0;MOBILE;ANDROID;ANDROID_1;ANDROID_2;ANDROID_3;ANDROID_4;ANDROID_5;ANDROID_6;ANDROID_7;ANDROID_8;ANDROID_9;ANDROID_10;ANDROID_11;ANDROID_12;ANDROID_13;ANDROID_14;ANDROID_15;ANDROID_16;ANDROID_17;ANDROID_18;ANDROID_19;ANDROID_20;ANDROID_21;ANDROID_22;ANDROID_23;ANDROID_24;ANDROID_25;ANDROID_26;ANDROID_27 /reference:/Library/Frameworks/Mono.framework/External/xbuild-frameworks/MonoAndroid/v1.0/Java.Interop.dll /reference:/Users/vsts/.nuget/packages/microsoft.appcenter.analytics/1.7.0/lib/MonoAndroid403/Microsoft.AppCenter.Analytics.Android.Bindings.dll /reference:/Users/vsts/.nuget/packages/microsoft.appcenter.analytics/1.7.0/lib/MonoAndroid403/Microsoft.AppCenter.Analytics.dll /reference:/Users/vsts/.nuget/packages/... Services/AudioService.cs(8,7): error CS0246: The type or namespace name 'AForge' could not be found (are you missing a using directive or an assembly reference?) [/Users/vsts/agent/2.136.1/work/1/s/XxxApp/XxxApp.csproj] Done Building Project"/Users/vsts/agent/2.136.1/work/1/s/XxxApp/XxxApp.csproj" (PackageForAndroid target(s)) -- FAILED.
So I tried your suggestion, but I get an error when I try to save the package:
a local file header is corrupted'
Would you have another suggestion?