xamarin inspector package didnt load in visual Studio 2017

Hi,

I always get the Error at Start of Visual Studio.

634
2017/09/07 07:37:22.664
Error

VisualStudio
LegacySitePackage failed for package [XamarinInspectorPackage]Source: '' Description: Falscher Parameter. (Ausnahme von HRESULT: 0x80070057 (E_INVALIDARG)) System.ArgumentException: Falscher Parameter. (Ausnahme von HRESULT: 0x80070057 (E_INVALIDARG)) bei EnvDTE.SolutionBuild.get_StartupProjects() bei Xamarin.VisualStudio.Inspector.XamarinInspectorPackage.GetStartupProject() in C:\d\lanes\4985\b63523e2\source\xamarinvs\src\Features\VisualStudio.Inspector\Vsix\XamarinInspectorPackage.cs:Zeile 282. bei Xamarin.VisualStudio.Inspector.XamarinInspectorPackage.RefreshInspectorSession() in C:\d\lanes\4985\b63523e2\source\xamarinvs\src\Features\VisualStudio.Inspector\Vsix\XamarinInspectorPackage.cs:Zeile 141. bei Xamarin.VisualStudio.Inspector.XamarinInspectorPackage.Initialize() in C:\d\lanes\4985\b63523e2\source\xamarinvs\src\Features\VisualStudio.Inspector\Vsix\XamarinInspectorPackage.cs:Zeile 108. bei Microsoft.VisualStudio.Shell.Package.Microsoft.VisualStudio.Shell.Interop.IVsPackage.SetSite(IServiceProvider sp)
{91D3BF5A-049A-4C78-AF4B-9AC149ADD84B}

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80070057 - E_INVALIDARG

How do I fix this?