The SqlParameterCollection only accepts non-null Parameter type objects

I am trying to use stored procedures in Entity Framework Core. When executing a stored procedure, I am passing two input parameters and one output parameter. I keep getting this error:

The SqlParameterCollection only accepts non-null SqlParameter type objects, not SqlParameter objects.

This is my code:

public string InsertCardsData(DateTime RecordingStartDate, DateTime RecordingEndDate)
{
        try
        {
            // DateTime DRecEndDate = Convert.ToDateTime(RecordingEndDate);
            DateTime DRecEndDate = RecordingEndDate.AddDays(1);

            var RecordStartDate = new SqlParameter
            {
                ParameterName = "RecordingStartDate",
                Value = RecordingStartDate,
                Direction = ParameterDirection.Input
            };

            var RecordEndDate = new SqlParameter
            {
                ParameterName = "RecordingEndDate",
                Value = DRecEndDate,
                Direction = ParameterDirection.Input
            };

            var RecordCount = new SqlParameter
            {
                ParameterName = "RecLoadCount",
                Direction = ParameterDirection.Output
            };

            var SQL = "Exec Recload_InsertPrimeExtract @RecordingStartDate, @RecordingEndDate, @RecLoadCount OUT";
            var result = _context.Database.ExecuteSqlRaw(SQL, RecordStartDate, RecordEndDate, RecordCount);
            var RecordCountValue = RecordCount.Value.ToString();

            return RecordCountValue;
        }
        catch (Exception ex)
        {
            return "";
        }
}

I will put a a meaningful catch statement, but right now, I am putting a breakpoints in catch statement and the above error occurs.

Any help will be highly appreciated.