Xamarin - visual studio mac - XamlCtask

Ao importar o projeto do instrutor e compilar fica dando essa mensagem dizendo que o arquivo deu falha que esse elemento é inesperado

O que fazer??

O objeto que dá o problema é Xamarin.Forms.targets. o código desse objeto.

<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
    <UsingTask TaskName="Xamarin.Forms.Build.Tasks.XamlGTask" AssemblyFile="Xamarin.Forms.Build.Tasks.dll"/>
    <UsingTask TaskName="Xamarin.Forms.Build.Tasks.FixedCreateCSharpManifestResourceName" AssemblyFile="Xamarin.Forms.Build.Tasks.dll"/>
    <UsingTask TaskName="Xamarin.Forms.Build.Tasks.XamlCTask" AssemblyFile="Xamarin.Forms.Build.Tasks.dll"/>

    <PropertyGroup>
        <CoreCompileDependsOn>
            XamlG;
            $(CoreCompileDependsOn);
        </CoreCompileDependsOn>
    </PropertyGroup>

    <PropertyGroup>
        <CompileDependsOn>
            $(CompileDependsOn);
            XamlC;
        </CompileDependsOn>
    </PropertyGroup>

    <Target Name="UpdateDesignTimeXaml" DependsOnTargets="XamlG"/>

    <Target Name="XamlG" DependsOnTargets="$(XamlGDependsOn)"/>

    <PropertyGroup>
        <XamlGDependsOn>
            _PreXamlG;
            _CollectXamlFiles;
            _CoreXamlG;
        </XamlGDependsOn>
    </PropertyGroup>

    <Target Name="_PreXamlG">
        <MakeDir Directories="$(IntermediateOutputPath)"/>
    </Target>

    <Target Name="_CollectXamlFiles">
        <ItemGroup>
            <_XamlResources Include="@(EmbeddedResource)" Condition="'%(Extension)' == '.xaml' AND '$(DefaultLanguageSourceExtension)' == '.cs'"/>
        </ItemGroup>
        <FixedCreateCSharpManifestResourceName ResourceFiles="@(_XamlResources)" RootNamespace="$(RootNamespace)">
            <Output TaskParameter="ResourceFilesWithManifestResourceNames" ItemName="XamlFiles" />
        </FixedCreateCSharpManifestResourceName>
        <ItemGroup>
            <XamlGFiles Include="@(XamlFiles->'$(IntermediateOutputPath)%(ManifestResourceName).g$(DefaultLanguageSourceExtension)')"/>
            <Compile Include="@(XamlGFiles)"/>
            <FileWrites Include="@(XamlGFiles)"/>
        </ItemGroup>
    </Target>

    <Target Name="_CoreXamlG"
        Inputs = "@(XamlFiles)"
        Outputs = "$(IntermediateOutputPath)%(ManifestResourceName).g$(DefaultLanguageSourceExtension)">
        <XamlGTask
            Source="@(XamlFiles)"
            Language = "$(Language)"
            AssemblyName = "$(AssemblyName)"
            OutputFile = "$(IntermediateOutputPath)%(ManifestResourceName).g$(DefaultLanguageSourceExtension)">
        </XamlGTask>
    </Target>

    <Target Name="XamlC">
        <XamlCTask
            Assembly = "$(IntermediateOutputPath)$(TargetFileName)"
            ReferencePath = "@(ReferencePath)"
            Verbosity = "2"
            OptimizeIL = "true"
            DebugSymbols = "$(DebugSymbols)" />
    </Target>
</Project>