WPI starting error

hello,

on starting WPI i've got the error: "Ungültiges XML-Element" (it means "Invalid XML-element")

after this the WPI is closing

What can I do?

Here is my log-file:

DownloadManager Information: 0 : Loading product xml from: file:///D:/Downloads/UmbracoCms.WebPI.6.0.0/manifest.xml
DownloadManager Information: 0 : Failed to load the feed 'D:\Downloads\UmbracoCms.WebPI.6.0.0\manifest.xml' after preprocessing, location on disk: 'C:\Users\eitel\AppData\Local\Microsoft\Web Platform Installer\preprocessor\644668928.xml.err'
DownloadManager Error: 0 : Error loading downloaded product file: 'System.InvalidOperationException: Ungültiges XML-Element: Im Element "feed" fehlt das erforderliche untergeordnete Element "id".
   bei Microsoft.Web.PlatformInstaller.ProductManager.LoadFeedId(XmlElement rootElement, XmlNamespaceManager nsm)
   bei Microsoft.Web.PlatformInstaller.ProductManager.LoadFromXmlInternal(LineInfoDocument xmlDoc, Boolean loadEnclosures)
   bei Microsoft.Web.PlatformInstaller.ProductManager.LoadFromXml(LineInfoDocument document, Boolean loadEnclosures)
   bei Microsoft.Web.PlatformInstaller.ProductManager.LoadFromXml(String xmlFile, Boolean loadEnclosures)
   bei Microsoft.Web.PlatformInstaller.ProductManager.Load(Uri productFileUrl, Boolean filterByArchitectureAndOS, Boolean loadEnclosures, Boolean useCachedVersion, String cacheDirectory, Architecture architecture, Int32 majorOS, Int32 minorOS, Int32 majorSP, Int32 minorSP, Int32 osType)'
DownloadManager Information: 0 : Failed to load the feed 'D:\Downloads\UmbracoCms.WebPI.6.0.0\manifest.xml' after preprocessing, location on disk: 'C:\Users\eitel\AppData\Local\Microsoft\Web Platform Installer\preprocessor\644668928.xml.err'
DownloadManager Error: 0 : Error loading product file: System.InvalidOperationException: Ungültiges XML-Element: Im Element "feed" fehlt das erforderliche untergeordnete Element "id".
   bei Microsoft.Web.PlatformInstaller.ProductManager.LoadFeedId(XmlElement rootElement, XmlNamespaceManager nsm)
   bei Microsoft.Web.PlatformInstaller.ProductManager.LoadFromXmlInternal(LineInfoDocument xmlDoc, Boolean loadEnclosures)
   bei Microsoft.Web.PlatformInstaller.ProductManager.LoadFromXml(LineInfoDocument document, Boolean loadEnclosures)
   bei Microsoft.Web.PlatformInstaller.ProductManager.LoadFromXml(String xmlFile, Boolean loadEnclosures)
   bei Microsoft.Web.PlatformInstaller.ProductManager.Load(Uri productFileUrl, Boolean filterByArchitectureAndOS, Boolean loadEnclosures, Boolean useCachedVersion, String cacheDirectory, Architecture architecture, Int32 majorOS, Int32 minorOS, Int32 majorSP, Int32 minorSP, Int32 osType)
   bei Microsoft.Web.PlatformInstaller.ProductManager.Load(Uri productFileUrl, Boolean filterByArchitectureAndOS, Boolean loadEnclosures, Boolean useCachedVersion, String cacheDirectory)
   bei Microsoft.Web.PlatformInstaller.ProductServiceImpl.LoadProducts(String primaryFeed, String[] feeds)

Greetings from Germany

Marko Eitel