Deserialize an XML file - an error in XML document (1, 2)?

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ASP.NET

XML

C#3.5

Hi Guys,

I'm trying to deserialize an XML, however i'm getting this exception:

There is an error in XML document (1,2).

InnerException Message
An exception of type 'System.InvalidOperationException' occurred in System.Xml.dll but was not handled in user code...

What I have tried:

I've searched the stackoverflow forum, google and implemented the advice, however I'm still getting the same error. Please find the enclosed some content of the xml file:

supplying XML as
<question xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
	<details>
		<text>
			<questiontext>Keyboard is an input or output device?
		
		<Option answer="true">
			<questionoption>input
		</Option>
		<Option answer="false">
			<questionoption>output
		</Option>
		<Option answer="false">
			<questionoption>both
		</Option>
		<Option answer="false">
			<questionoption>none
		</Option>
		<mediaurl>
			<url>~/Core/MediaFiles/Keyboard_27_02_38_19_27.JPG

XML.CS
using System;
using System.Xml.Serialization;
using TeTec.Business.Entities.Common;
using TeTec.Business.Entities.Model;
using TeTec.Utility.XML;

namespace TeTec.Business.Entities.Model.Question
{
    [XmlRoot(ElementName = "Question")]
    public class QuestionDetailsInfo : ICBO<int>
    {
        [XmlIgnore]
        public int ID { get; set; }

        [XmlIgnore]
        public long QuestionID { get; set; }

        [XmlIgnore]
        public int QuestionLanguageID { get; set; }

        private QuestionDetailsXMLInfo _questionDetailsXML = new QuestionDetailsXMLInfo();

        [XmlIgnore]
        public string DetailXml
        {
            get { return XMLSerializer.GetXML<questiondetailsxmlinfo>(_questionDetailsXML, true); }
            set { if (!string.IsNullOrEmpty(value)) _questionDetailsXML = XMLSerializer.GetObject<questiondetailsxmlinfo>(value); }
        }

        [XmlElement(ElementName = "Details")]
        public QuestionDetailsXMLInfo QuestionDetailsXML
        {
            get { return _questionDetailsXML; }
            set { _questionDetailsXML = value; }
        }

        [XmlIgnore]
        public bool? IsActive { get; set; }

        [XmlIgnore]
        public DateTime Updated { get; set; }
        
        [XmlIgnore]
        public int Identity => ID;
    }

	
}

anyone can please help me.

Thanks