Need help Xna Xml Deserializing

I have been trying to figure out the cause of my problem.
Every time i try to compile it comes up with this error message.

There was an error while deserializing intermediate XML. Cannot find type "RpgLibary.ItemClasses.ContainerData". Line: 3 Column: 10

and here is my xml file

<?xml version="1.0" encoding="utf-8"?>
<XnaContent xmlns:ItemClasses="RpgLibary.ItemClasses">
<Asset Type="ItemClasses:ContainerData">
<Name>Big Gold Chest</Name>
<DifficultyLevel>Normal</DifficultyLevel>
<IsLocked>true</IsLocked>
<IsTrapped>false</IsTrapped>
<TrapName Null="true" />
<KeyName>Golden Key</KeyName>
<KeyType>Golden Key</KeyType>
<KeysRequired>2</KeysRequired>
<MinGold>500</MinGold>
<MaxGold>750</MaxGold>
<ItemCollection />
</Asset>
</XnaContent>


and my ContainerData class

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using RpgLibary.SkillClasses;
namespace RpgLibary.ItemClasses
{
public class ContainerData
{
public string Name;
public DifficultyLevel DifficultyLevel;
public bool IsLocked;
public bool IsTrapped;
public string TrapName;
public string KeyName;
public string KeyType;
public int KeysRequired;
public int MinGold;
public int MaxGold;
public Dictionary<string, string> ItemCollection;
public ContainerData()
{
ItemCollection = new Dictionary<string, string>();
}
public override string ToString()
{
string toString = Name + ", ";
toString += DifficultyLevel.ToString() + ", ";
toString += IsLocked.ToString() + ", ";
toString += IsTrapped.ToString() + ", ";
toString += TrapName + ", ";
toString += KeyName + ", ";
toString += KeyType + ", ";
toString += KeysRequired.ToString() + ", ";
toString += MinGold.ToString() + ", ";
toString += MaxGold.ToString();
foreach (KeyValuePair<string, string> pair in ItemCollection)
{
toString += ", " + pair.Key + "+" + pair.Value;
}
return toString;
}
}
}


I have searched up my problem but none seem to relate to me, they say to have the content type in a diffrent project which is what i did.
here is my compile order:
---------------------------------
RpgLibary
rpg
---------------------------------

Thanks for reading if theres any other files you want to look at just ask.