The Line:
System.Xml.Serialization.XmlSerializer xmls = new System.Xml.Serialization.XmlSerializer(md.GetType() );

The Class:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace RPG_test
{
    public class MapData
    {
        public int[][][] tiles; //layer, x, y = tile
        public int[] layerTilesets;
        public List<String> tilesets;
        public List<int>[] blobTiles; // indexed on tileset
        public int width{ set; get; }
        public int height{ set; get; }
        public int layers{ set; get; }
        public int playerLayer{ set; get; }
    }
}



The Exception:
System.InvalidOperationException was unhandled
  Message=Unable to generate a temporary class (result=1).
error CS1026: ) expected
error CS1002: ; expected
error CS1525: Invalid expression term ')'
error CS1002: ; expected
error CS1525: Invalid expression term ')'
error CS1002: ; expected
error CS1026: ) expected
error CS1002: ; expected
error CS1525: Invalid expression term ')'
error CS1002: ; expected
error CS1525: Invalid expression term ')'
error CS1002: ; expected

  Source=System.Xml
  StackTrace:
       at System.Xml.Serialization.Compiler.Compile(Assembly parent, String ns, XmlSerializerCompilerParameters xmlParameters, Evidence evidence)
       at System.Xml.Serialization.TempAssembly.GenerateAssembly(XmlMapping[] xmlMappings, Type[] types, String defaultNamespace, Evidence evidence, XmlSerializerCompilerParameters parameters, Assembly assembly, Hashtable assemblies)
       at System.Xml.Serialization.XmlSerializer.GenerateTempAssembly(XmlMapping xmlMapping, Type type, String defaultNamespace)
       at System.Xml.Serialization.XmlSerializer..ctor(Type type, String defaultNamespace)
       at System.Xml.Serialization.XmlSerializer..ctor(Type type)
       at RPG_test.Map.Load(String filename) in C:\Users\SirEel\Documents\Visual Studio 2010\Projects\RPG test\RPG test\RPG test\Map.cs:line 266
       at RPG_test.Map..ctor(IServiceProvider Service, String filename) in C:\Users\SirEel\Documents\Visual Studio 2010\Projects\RPG test\RPG test\RPG test\Map.cs:line 71
       at RPG_test.Engine.LoadContent() in C:\Users\SirEel\Documents\Visual Studio 2010\Projects\RPG test\RPG test\RPG test\Engine.cs:line 87
       at Microsoft.Xna.Framework.Game.Initialize()
       at RPG_test.Engine.Initialize() in C:\Users\SirEel\Documents\Visual Studio 2010\Projects\RPG test\RPG test\RPG test\Engine.cs:line 75
       at Microsoft.Xna.Framework.Game.RunGame(Boolean useBlockingRun)
       at Microsoft.Xna.Framework.Game.Run()
       at RPG_test.Program.Main(String[] args) in C:\Users\SirEel\Documents\Visual Studio 2010\Projects\RPG test\RPG test\RPG test\Program.cs:line 15
  InnerException: