how do i port from unity3d to windows phone 8

These are the following errors i get while building the unity project to windows phone 8. 1) Error building Player: Exception: Error: method System.Byte[] System.IO.File::ReadAllBytes(System.String) doesn't exist in target framework. It is referenced from Assembly-CSharp.dll at System.Byte[] NGUITools::Load(System.String).

2) Error: type System.Timers.Timer doesn't exist in target framework. It is referenced from Assembly-CSharp.dll at CEnergyManager.

3) Error: type System.Runtime.Serialization.Formatters.Binary.BinaryFormatter doesn't exist in target framework. It is referenced from Assembly-CSharp.dll at BinarySerializer.

4) Error: type System.Runtime.Serialization.Formatters.Binary.BinaryFormatter doesn't exist in target framework. It is referenced from Assembly-CSharp.dll at System.Void BinarySerializer::SerializeObjectList(System.Collections.Generic.List`1).

5) Error: method System.Xml.XmlWriter System.Xml.XmlWriter::Create(System.String,System.Xml.XmlWriterSettings) doesn't exist in target framework. It is referenced from Assembly-CSharp.dll at System.Void CExperiencePoints::writeXML().

could you please help me with solutions for these errors