ASP.NET Session Service not working

I have a small learn-project. We dev the site and for backend I choosed the ASP.NET. For project I need to use Session service, and I include it in this manner:

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddDistributedMemoryCache();
builder.Services.AddSession();
var app = builder.Build();
app.UseSession();
app.MapGet("/", () => "Hello World!");
app.Run();

And after compile get this:

fail: Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingProvider[48]
      An error occurred while reading the key ring.
      System.Xml.XmlException: '.', hexadecimal value 0x00, is an invalid character. Line 1, position 1.
         at System.Xml.XmlTextReaderImpl.Throw(Exception e)
         at System.Xml.XmlTextReaderImpl.Throw(String res, String[] args)
         at System.Xml.XmlTextReaderImpl.ThrowInvalidChar(Char[] data, Int32 length, Int32 invCharPos)
         at System.Xml.XmlTextReaderImpl.ParseRootLevelWhitespace()
         at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
         at System.Xml.XmlTextReaderImpl.Read()
         at System.Xml.XmlReader.MoveToContent()
         at System.Xml.Linq.XElement.Load(XmlReader reader, LoadOptions options)
         at System.Xml.Linq.XElement.Load(Stream stream, LoadOptions options)
         at System.Xml.Linq.XElement.Load(Stream stream)
         at Microsoft.AspNetCore.DataProtection.Repositories.FileSystemXmlRepository.ReadElementFromFile(String fullPath)
         at Microsoft.AspNetCore.DataProtection.Repositories.FileSystemXmlRepository.GetAllElementsCore()+MoveNext()
         at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
         at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
         at Microsoft.AspNetCore.DataProtection.Repositories.FileSystemXmlRepository.GetAllElements()
         at Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager.GetAllKeys()
         at Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingProvider.CreateCacheableKeyRingCore(DateTimeOffset now, IKey keyJustAdded)
         at Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingProvider.Microsoft.AspNetCore.DataProtection.KeyManagement.Internal.ICacheableKeyRingProvider.GetCacheableKeyRing(DateTimeOffset now)
         at Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingProvider.GetCurrentKeyRingCore(DateTime utcNow, Boolean forceRefresh)

What is it? And how to solve it?