Entity Framework Core no mapping to a relational type can be found for the CLR type 'object[]'

Good day,

    I am having an issue using the .FromSqlRaw as it it returning an Unhandled Exception: InvalidOperationException: No mapping to a relation type can be found for the CLR type ;object[]'.  While this might sound simple, I am passing the stored procedure string and the parameters to the .FromSqlRaw.

So the following is what is throwing the error:

public async Task<List<MyClass>> LoadDataAsync<U>(string storedProcedure, U parameter)
{
     var optionsBuilder = new DbContextOptionsBuilder<DbContext>().UseSqlServer(Configuration.GetConnectionString("Default"));
     using DbContext dbContext = new DbContext(optionsBuilder.Options))
    {
         List<MyClass> myClass = await dbContext.MyClass.FromSqlRaw(storedProcedure, parameters).ToListAsync();

         return myClass;
    }
}

Now I am passing the following into that:

public async Task<IList<MyClass>> GetIdAsync(string name, string normalName, DateTime createdDate)
{
     var output = await _sql.LoadDataAsync<object>("[dbo].[GetDBId] @p0, @p1, @p2", new [] { name, normalName, createdDate });
     return output;
}

I know the stored procedure works, because if I Execute that stored procedure with the same values from SQL Server Management Studio it displays the correct output.  So I know the issue with with the input the stored procedure and the .FromSqlRaw not liking how I pass the information to it.  I had tried _sql.LoadDataAsync<dynamic> before but it too errored out.  In this case I am passing three objects but some of my stored procedures have upwards of 18 parameters, so I need that LoadDataAsync to be able to accept any number of parameters.

If anyone has a thought on what might help I would appreciate it.