Cannot load assembly: Microsoft.Bcl.AsyncInterfaces

I have an app: Blazor+NET Core 3.1=Npgsql EF Core latest. When this code works it generates an exception

x = {“Could not load file or assembly ‘Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51’. The system cannot find the file specified.”:"Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToke…

public ItemsDTO<Customers> GetCustomersGridRows(Action<IGridColumnCollection<Customers>> columns,
            QueryDictionary<StringValues> query)
        {
            try
            { 
                var context = new PMdbContext(_options);

                //using (var context = new PMdbContext(_options))
                {
                    var repository = new CustomersRepository(context);
                    var server = new GridServer<Customers>(repository.GetAll(), new QueryCollection(query),
                        true, "customersGrid", columns)
                            .Sortable()
                            .WithPaging(10)
                            .Filterable()
                            .WithMultipleFilters()
                            .Groupable(true)
                            .Searchable(true, false, false);

                    // return items to displays
                    var items = server.ItemsToDisplay;

                    // uncomment the following lines are to test null responses
                    //items = null;
                    //items.Items = null;
                    //items.Pager = null;
                    return items;
                }

            }
            catch(Exception x)
            {
         // <-------------!!
            }
            return null;
        }

I have another function where I do not use EF but use direct Npgsql without EF queries to the database it works. What can be the reason?

It seems: Microsoft.EntityFrameworkCore depends on Microsoft.Bcl.AsyncInterfaces. How to fix it?

[AntonTalalaev]

Had the same issue. Solved by upgrading EF to latest ver 5.* Before that my EF ver was 3.* @roji, Thank you for your useful comments

[roji]

Since Microsoft.Bcl.AsyncInterfaces is a dependency of EF Core 3.x, it should simply get installed by nuget - unless you specified removed it or avoided deploying it, it should simply be there and work.