Deserialize an stream recived from a socket

private static byte[] ConvertToByteArray(object obj)
{
try
{
BinaryFormatter Formatador = new BinaryFormatter();
MemoryStream Stream = new MemoryStream();
Formatador.Serialize(Stream, obj);
return Stream.ToArray();
}
catch (Exception ex)
{
Console.WriteLine("Object Could Not be Converted To a Byte.");
MessageBox.Show(ex.Message);
}
return null;
}
thats de function to convert a object into a byte array and below are the function to convert a byte array into a object

private object ConvertToObject(byte[] byteArray)
{
try
{
BinaryFormatter Formatador = new BinaryFormatter();
MemoryStream stream = new MemoryStream(byteArray);
stream.Position = 0;
return (SystemInfo)Formatador.Deserialize(stream);
}
catch (Exception ex)
{
MessageBox.Show("Object Could Not be Converted To a Byte. Error message: " + ex.Message);
}
return null;
}

The function to convert to byte array works well, but now when I try to convert to a object it throw an exception saying " Can not find assembly 'Server, Version = 1.0.0.0, Culture = neutral, PublicKeyToken = null'."

sorry for the bothering...