Option strict disallows late binding

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.NET

I have an object that I'm trying to reference but I get the error:
Option Strict disallows late binding

In the code below, the underlined object is what causes the error

Public Sub Sort(contacts As Object, comparer As Object, fieldName As String, direction As String)
       Dim itemIndex As Integer = 0

       Select Case fieldName
           Case "FirstName"
               If direction = "decend" Then
                   comparer = serializeInfo.OrderByDescending(Function(x) x.FirstName).ToList()
                   For itemIndex = 0 To serializeInfo.Count - 1
                       Console.WriteLine(comparer(itemIndex).FirstName)
                   Next
               Else
                   comparer = serializeInfo.OrderBy(Function(x) x.FirstName).ToList()
               End If

I can't get preview to work so I'm leaving the code as is.
thanks for any help.

What I have tried:

Some casting
Create object