DataFile c#

when I try to store data on a DataFile using:

Code:

Interface.GetMod().DataFileSystem.WriteObject("MyDataFile", storedData);

it says that Interface does not exist in the current context, must I do something to create the file before i use this code?

 

Show us your code..

 

This is code :
http://pastebin.com/zt9uDW0B

 

And i dont see a credit in that code :x + Developer Name

 

I have tried to create it on plugin init:

Code:

[Info("SaveData", "developer", "0.0.1")]
  [Description("Save data on a data file into oxide/data")]
  class HitMarker : RustPlugin{
  static Dictionary<ulong, bool> PlayersData;
void Init(){
    try {
        PlayersData = Interface.GetMod().DataFileSystem.ReadObject<PlayersData>("HitMarkerData");
    } catch { }
    if (PlayersData == null) PlayersData = new Dictionary<ulong, boolean>();
}
}