无法安装程序包Xamarin.Firebase.Messaging

我正在尝试在我的Xamarin.Forms解决方案的Xamarin.Android项目中安装最新版本的Xamarin.Firebase.Messaging（截至今天：60.1142.1）

我得到这个错误：

Attempting to gather dependency information for package 'Xamarin.Firebase.Messaging.60.1142.1' with respect to project 'prova.Droid', targeting 'MonoAndroid,Version=v7.1'
GET https://api.nuget.org/v3/registration3-gz-semver2/xamarin.firebase.messaging/index.json
OK https://api.nuget.org/v3/registration3-gz-semver2/xamarin.firebase.messaging/index.json 137ms
Total number of results gathered : 20
Gathering dependency information took 157,61 ms
Summary of time taken to gather dependencies per source :
https://api.nuget.org/v3/index.json -   156,72 ms
Attempting to resolve dependencies for package 'Xamarin.Firebase.Messaging.60.1142.1' with DependencyBehavior 'Lowest'
Resolving dependency information took 0 ms
Resolving actions to install package 'Xamarin.Firebase.Messaging.60.1142.1'
Resolved actions to install package 'Xamarin.Firebase.Messaging.60.1142.1'
Retrieving package 'Xamarin.Firebase.Messaging 60.1142.1' from 'nuget.org'.
GET https://api.nuget.org/v3-flatcontainer/xamarin.firebase.messaging/60.1142.1/xamarin.firebase.messaging.60.1142.1.nupkg
OK https://api.nuget.org/v3-flatcontainer/xamarin.firebase.messaging/60.1142.1/xamarin.firebase.messaging.60.1142.1.nupkg 540ms
Acquiring lock for the installation of Xamarin.Firebase.Messaging 60.1142.1
Acquired lock for the installation of Xamarin.Firebase.Messaging 60.1142.1
Installing Xamarin.Firebase.Messaging 60.1142.1.
Completed installation of Xamarin.Firebase.Messaging 60.1142.1
For adding package 'Xamarin.Firebase.Messaging.60.1142.1' to project 'prova.Droid' that targets 'monoandroid71'.
Install failed. Rolling back...
Package 'Xamarin.Firebase.Messaging.60.1142.1' does not exist in project 'prova.Droid'
Package 'Xamarin.Firebase.Messaging.60.1142.1' does not exist in folder '/Users/g.paradiso/Projects/prova/packages'
Executing nuget actions took 592,47 ms
Could not install package 'Xamarin.Firebase.Messaging 60.1142.1'. You are trying to install this package into a project that targets 'MonoAndroid,Version=v7.1', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author.

我遵循指南，它说您需要使用版本57.1104.0-beta1，它可以工作，但为什么我不能使用最新版本

无法安装程序包“Xamarin.Firebase.Messaging 60.1142.1”。你 正在尝试将此包安装到目标为的项目中 “MonoAndroid，Version=v7.1”，但该软件包不包含任何 与之兼容的程序集引用或内容文件 框架

简而言之，这意味着一个兼容性问题，如果需要，请阅读几遍，直到您得到它。

要解决此问题，请检查“Xamarin.Firebase.Messaging 60.1142.1”NuGet软件包的依赖项。当您拥有

monoardi7.1

时，它清楚地说明了

monoardi8.0

因此，您可以使用较旧版本的

Xamarin.Firebase.Messaging

（不推荐），也可以将Android项目中的目标框架更新为8.0

无法安装程序包“Xamarin.Firebase.Messaging 60.1142.1”。你 正在尝试将此包安装到目标为的项目中 “MonoAndroid，Version=v7.1”，但该软件包不包含任何 与之兼容的程序集引用或内容文件 框架

简而言之，这意味着一个兼容性问题，如果需要，请阅读几遍，直到您得到它。

要解决此问题，请检查“Xamarin.Firebase.Messaging 60.1142.1”NuGet软件包的依赖项。当您拥有

monoardi7.1

时，它清楚地说明了

monoardi8.0

因此，您可以使用较旧版本的

Xamarin.Firebase.Messaging

（不推荐），也可以将Android项目中的目标框架更新为8.0