Monogame ContentPipeline

Hello,

i am currently trying to get ContentPipeline run…
My sprite without effect is rendered correctly.

But loading a effect file , doesnt work;/

//------------------------------ TEXTURE PROPERTIES ----------------------------
// This is the texture that SpriteBatch will try to set before drawing
texture ScreenTexture;
 
// Our sampler for the texture, which is just going to be pretty simple
sampler TextureSampler = sampler_state
{
    Texture = <ScreenTexture>;
};
 
//------------------------ PIXEL SHADER ----------------------------------------
// This pixel shader will simply look up the color of the texture at the
// requested point
float4 PixelShaderFunction(float2 TextureCoordinate : TEXCOORD0) : COLOR0
{
    float4 color = tex2D(TextureSampler, TextureCoordinate); 
float value = (color.r + color.g + color.b) / 3; 
    color.r = value;
    color.g = value;
    color.b = value;
    return color;
}
 
//-------------------------- TECHNIQUES ----------------------------------------
// This technique is pretty simple - only one pass, and only a pixel shader
technique Plain
{
    pass Pass1
    {
         

      PixelShader = compile ps_2_0 PixelShaderFunction();

                               
    }
}

when i am using this:
PixelShader = compile ps_4_0_level_9_1 PixelShaderFunction();

i get this message : Pixel shader ‘PixelShaderFunction’ must be SM 3.0 or lower!

<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="4.0">
  <Import Project="$(MSBuildExtensionsPath)\MonoGame\v3.0\MonoGame.ContentPipeline.targets" />
  <PropertyGroup>
    <ProjectGuid>{76F2AEE9-3A0A-48B0-9060-309633509DAF}</ProjectGuid>
    <ProjectTypeGuids>{6D335F3A-9D43-41b4-9D22-F6F17C4BE596};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
    <Configuration Condition=" '$(Configuration)' == '' ">Windows</Configuration>
    <Platform Condition=" '$(Platform)' == '' ">x86</Platform>
    <OutputType>Library</OutputType>
    <AppDesignerFolder>Properties</AppDesignerFolder>
    <RootNamespace>ContentBuilder</RootNamespace>
    <AssemblyName>IgnoreMe</AssemblyName>
    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
    <TargetFrameworkProfile>Client</TargetFrameworkProfile>
    <XnaFrameworkVersion>v4.0</XnaFrameworkVersion>
    <OutputPath>bin\$(Configuration)</OutputPath>
    <XnaPlatform>Windows</XnaPlatform>
    <XnaProfile>HiDef</XnaProfile>
    <XnaCrossPlatformGroupID>613fe2e9-56c2-4459-908f-61239dffbfd0</XnaCrossPlatformGroupID>
    <XnaOutputType>Library</XnaOutputType>
    <PlatformTarget>x86</PlatformTarget>
    <UseVSHostingProcess>false</UseVSHostingProcess>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)' == 'Windows' ">
    <MonoGamePlatform>Windows</MonoGamePlatform>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)' == 'Windows8' ">
    <MonoGamePlatform>Windows8</MonoGamePlatform>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)' == 'Android' ">
    <MonoGamePlatform>Android</MonoGamePlatform>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)' == 'iOS' ">
    <MonoGamePlatform>iOS</MonoGamePlatform>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)' == 'OSX' ">
    <MonoGamePlatform>OSX</MonoGamePlatform>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)' == 'Linux' ">
    <MonoGamePlatform>Linux</MonoGamePlatform>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)' == 'PSM' ">
    <MonoGamePlatform>PSM</MonoGamePlatform>
  </PropertyGroup>
  <ItemGroup>
    <Reference Include="mscorlib" />
  </ItemGroup>
  <ItemGroup>
    <ProjectReference Include="..\MonoContentContent\MonoContentContent.contentproj">
      <Name>MonoContentContent</Name>
      <XnaReferenceType>Content</XnaReferenceType>
    </ProjectReference>
  </ItemGroup>
  <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
  <Import Project="$(MSBuildExtensionsPath)\Microsoft\XNA Game Studio\Microsoft.Xna.GameStudio.targets" />
  <!--
      To modify your build process, add your task inside one of the targets below and uncomment it. 
      Other similar extension points exist, see Microsoft.Common.targets.
      <Target Name="BeforeBuild">
      </Target>
      <Target Name="AfterBuild">
      </Target>
    -->
</Project>