Xamarin.ios Item Tip Error MSB3174: Invalid value for "TargetFrameworkVersion"

Xamarin.ios Item Tip Error MSB3174: Invalid value for "TargetFrameworkVersion"

Error message: Msbulid\14.0\bin\microsoft.common.currentversion.targets (3506.5): Error MSB3174: "TargetFrameworkVersion" The value is invalid
This problem will appear in Xamarin.ios and xamarin.android. The solution differs depending on the project type.
In the Xamarin.ios project, you need to modify the. csproj file for the project. Find the following code in it:
< generatemanifests >true</generatemanifests >
Set the true setting to False.
In the Xamarin.android project, you need to modify the. csproj file for the project. In which, find the first <PropertyGroup> branch. Add the following configuration items in it:
<TargetFrameworkVersion>v6.0</TargetFrameworkVersion>
Change 6.0 of these to the version of the Android API.

Xamarin.ios Item Tip Error MSB3174: Invalid value for "TargetFrameworkVersion"