我昨天更新了VS 2019，今天我试图为asp.net core web应用程序创建新项目，项目已创建，但当我构建解决方案或尝试运行解决方案时，我一直得到以下错误。
Error MSB4018 The "ResolveTargetingPackAssets" task failed unexpectedly.
完整的错误细节
Severity Code Description Project File Line Suppression State
Error MSB4018 The "ResolveTargetingPackAssets" task failed unexpectedly.
System.IO.FileNotFoundException: Could not find file 'C:\Program Files\dotnet\packs\Microsoft.AspNetCore.App.Ref\3.1.2\data\FrameworkList.xml'.
File name: 'C:\Program Files\dotnet\packs\Microsoft.AspNetCore.App.Ref\3.1.2\data\FrameworkList.xml'
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize)
at System.Xml.XmlDownloadManager.GetStream(Uri uri, ICredentials credentials, IWebProxy proxy, RequestCachePolicy cachePolicy)
at System.Xml.XmlUrlResolver.GetEntity(Uri absoluteUri, String role, Type ofObjectToReturn)
at System.Xml.XmlTextReaderImpl.FinishInitUriString()
at System.Xml.XmlTextReaderImpl..ctor(String uriStr, XmlReaderSettings settings, XmlParserContext context, XmlResolver uriResolver)
at System.Xml.XmlReaderSettings.CreateReader(String inputUri, XmlParserContext inputContext)
at System.Xml.XmlReader.Create(String inputUri, XmlReaderSettings settings, XmlParserContext inputContext)
at System.Xml.Linq.XDocument.Load(String uri, LoadOptions options)
at Microsoft.NET.Build.Tasks.ResolveTargetingPackAssets.AddReferencesFromFrameworkList(String frameworkListPath, String targetingPackDllFolder, ITaskItem targetingPack, List`1 referenceItems)
at Microsoft.NET.Build.Tasks.ResolveTargetingPackAssets.ExecuteCore()
at Microsoft.NET.Build.Tasks.TaskBase.Execute()
at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext() WebApplicationLoginTest C:\Program Files\dotnet\sdk\3.1.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.FrameworkReferenceResolution.targets 283
旧项目我可以运行，问题似乎只出现在我创建的新项目上。
这可能是由于我昨天更新了VS。