Display Content Error!

SharpDevelop Version : 5.1.0.5134-RC-d5052dc5
.NET Version         : 4.6.00081
OS Version           : Microsoft Windows NT 6.3.9600.0
Current culture      : Chinese (Simplified, China) (zh-CN)
Current UI language  : en
Running under WOW6432, processor architecture: x86-64
Working Set Memory   : 135324kb
GC Heap Memory       : 9707kb

Unhandled WPF exception
Exception thrown:
System.Xml.XmlException: The 'title' start tag on line 1 position 485 does not match the end tag of 'topic'. Line 1, position 669.
   at System.Xml.XmlTextReaderImpl.Throw(Exception e)
   at System.Xml.XmlTextReaderImpl.Throw(String res, String[ args)
   at System.Xml.XmlTextReaderImpl.ThrowTagMismatch(NodeData startTag)
   at System.Xml.XmlTextReaderImpl.ParseEndElement()
   at System.Xml.XmlTextReaderImpl.ParseElementContent()
   at System.Xml.XmlTextReaderImpl.Read()
   at System.Xml.Linq.XContainer.ReadContentFrom(XmlReader r)
   at System.Xml.Linq.XContainer.ReadContentFrom(XmlReader r, LoadOptions o)
   at System.Xml.Linq.XElement.ReadElementFrom(XmlReader r, LoadOptions o)
   at System.Xml.Linq.XElement.Load(XmlReader reader, LoadOptions options)
   at System.Xml.Linq.XElement.Parse(String text, LoadOptions options)
   at MSHelpSystem.Controls.TocEntry.<.ctor>b__3_0(Object _, DownloadStringCompletedEventArgs e)
   at System.Net.WebClient.OnDownloadStringCompleted(DownloadStringCompletedEventArgs e)
   at System.Net.WebClient.DownloadStringOperationCompleted(Object arg)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

---- Recent log messages:
15:44:41.549 [1] ERROR - Unhandled WPF exception
--> Exception:
System.Xml.XmlException: The 'title' start tag on line 1 position 946 does not match the end tag of 'topic'. Line 1, position 1113.
   at System.Xml.XmlTextReaderImpl.Throw(Exception e)
   at System.Xml.XmlTextReaderImpl.Throw(String res, String[ args)
   at System.Xml.XmlTextReaderImpl.ThrowTagMismatch(NodeData startTag)
   at System.Xml.XmlTextReaderImpl.ParseEndElement()
   at System.Xml.XmlTextReaderImpl.ParseElementContent()
   at System.Xml.XmlTextReaderImpl.Read()
   at System.Xml.Linq.XContainer.ReadContentFrom(XmlReader r)
   at System.Xml.Linq.XContainer.ReadContentFrom(XmlReader r, LoadOptions o)
   at System.Xml.Linq.XElement.ReadElementFrom(XmlReader r, LoadOptions o)
   at System.Xml.Linq.XElement.Load(XmlReader reader, LoadOptions options)
   at System.Xml.Linq.XElement.Parse(String text, LoadOptions options)
   at MSHelpSystem.Controls.TocEntry.<.ctor>b__3_0(Object _, DownloadStringCompletedEventArgs e)
   at System.Net.WebClient.OnDownloadStringCompleted(DownloadStringCompletedEventArgs e)
   at System.Net.WebClient.DownloadStringOperationCompleted(Object arg)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
15:44:41.549 [1] DEBUG - HelpViewer: TocEntry "Windows Development (Windows)" found
15:44:46.715 [1] DEBUG - ActiveViewContentChanged to
15:44:46.715 [1] DEBUG - ActiveContentChanged to ICSharpCode.StartPage.StartPageViewContent
15:44:46.762 [1] DEBUG - ActiveWorkbenchWindowChanged to [AvalonWorkbenchWindow: Start Page]
15:44:46.762 [1] DEBUG - NavigationService
    ActiveViewContent: Start Page
              Subview: TabPageText
15:44:46.763 [1] DEBUG - ActiveViewContentChanged to ICSharpCode.StartPage.StartPageViewContent
15:44:47.361 [1] DEBUG - ActiveViewContentChanged to
15:44:47.361 [1] DEBUG - ActiveContentChanged to
15:44:47.361 [1] DEBUG - ActiveWorkbenchWindowChanged to
15:44:51.731 [1] DEBUG - ActiveContentChanged to MSHelpSystem.Controls.Help3TocPad
15:44:51.733 [1] DEBUG - HelpViewer: 1 HelpLibraryAgent process found
15:44:51.734 [1] DEBUG - HelpViewer: HelpLibraryAgent has process ID "9360"
15:44:51.736 [1] DEBUG - HelpViewer: 1 HelpLibraryAgent process found
15:44:51.737 [1] DEBUG - HelpViewer: HelpLibraryAgent has process ID "9360"
15:44:51.756 [1] DEBUG - HelpViewer: TocEntry "Visual Studio Application Lifecycle Management" found
15:44:51.756 [1] ERROR - Unhandled WPF exception
--> Exception:
System.Xml.XmlException: The 'title' start tag on line 1 position 485 does not match the end tag of 'topic'. Line 1, position 669.
   at System.Xml.XmlTextReaderImpl.Throw(Exception e)
   at System.Xml.XmlTextReaderImpl.Throw(String res, String[ args)
   at System.Xml.XmlTextReaderImpl.ThrowTagMismatch(NodeData startTag)
   at System.Xml.XmlTextReaderImpl.ParseEndElement()
   at System.Xml.XmlTextReaderImpl.ParseElementContent()
   at System.Xml.XmlTextReaderImpl.Read()
   at System.Xml.Linq.XContainer.ReadContentFrom(XmlReader r)
   at System.Xml.Linq.XContainer.ReadContentFrom(XmlReader r, LoadOptions o)
   at System.Xml.Linq.XElement.ReadElementFrom(XmlReader r, LoadOptions o)
   at System.Xml.Linq.XElement.Load(XmlReader reader, LoadOptions options)
   at System.Xml.Linq.XElement.Parse(String text, LoadOptions options)
   at MSHelpSystem.Controls.TocEntry.<.ctor>b__3_0(Object _, DownloadStringCompletedEventArgs e)
   at System.Net.WebClient.OnDownloadStringCompleted(DownloadStringCompletedEventArgs e)
   at System.Net.WebClient.DownloadStringOperationCompleted(Object arg)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
15:44:51.789 [1] DEBUG - HelpViewer: TocEntry "Visual Studio" found
15:44:51.794 [1] ERROR - Unhandled WPF exception
--> Exception:
System.Xml.XmlException: The 'title' start tag on line 1 position 463 does not match the end tag of 'topic'. Line 1, position 623.
   at System.Xml.XmlTextReaderImpl.Throw(Exception e)
   at System.Xml.XmlTextReaderImpl.Throw(String res, String[ args)
   at System.Xml.XmlTextReaderImpl.ThrowTagMismatch(NodeData startTag)
   at System.Xml.XmlTextReaderImpl.ParseEndElement()
   at System.Xml.XmlTextReaderImpl.ParseElementContent()
   at System.Xml.XmlTextReaderImpl.Read()
   at System.Xml.Linq.XContainer.ReadContentFrom(XmlReader r)
   at System.Xml.Linq.XContainer.ReadContentFrom(XmlReader r, LoadOptions o)
   at System.Xml.Linq.XElement.ReadElementFrom(XmlReader r, LoadOptions o)
   at System.Xml.Linq.XElement.Load(XmlReader reader, LoadOptions options)
   at System.Xml.Linq.XElement.Parse(String text, LoadOptions options)
   at MSHelpSystem.Controls.TocEntry.<.ctor>b__3_0(Object _, DownloadStringCompletedEventArgs e)
   at System.Net.WebClient.OnDownloadStringCompleted(DownloadStringCompletedEventArgs e)
   at System.Net.WebClient.DownloadStringOperationCompleted(Object arg)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
15:44:54.627 [1] DEBUG - HelpViewer: 1 HelpLibraryAgent process found
15:44:54.629 [1] DEBUG - HelpViewer: HelpLibraryAgent has process ID "9360"
15:44:54.630 [1] DEBUG - HelpViewer: 1 HelpLibraryAgent process found
15:44:54.631 [1] DEBUG - HelpViewer: HelpLibraryAgent has process ID "9360"
15:44:54.650 [1] DEBUG - HelpViewer: TocEntry "Visual Studio Application Lifecycle Management" found
15:44:54.650 [1] ERROR - Unhandled WPF exception
--> Exception:
System.Xml.XmlException: The 'title' start tag on line 1 position 485 does not match the end tag of 'topic'. Line 1, position 669.
   at System.Xml.XmlTextReaderImpl.Throw(Exception e)
   at System.Xml.XmlTextReaderImpl.Throw(String res, String[ args)
   at System.Xml.XmlTextReaderImpl.ThrowTagMismatch(NodeData startTag)
   at System.Xml.XmlTextReaderImpl.ParseEndElement()
   at System.Xml.XmlTextReaderImpl.ParseElementContent()
   at System.Xml.XmlTextReaderImpl.Read()
   at System.Xml.Linq.XContainer.ReadContentFrom(XmlReader r)
   at System.Xml.Linq.XContainer.ReadContentFrom(XmlReader r, LoadOptions o)
   at System.Xml.Linq.XElement.ReadElementFrom(XmlReader r, LoadOptions o)
   at System.Xml.Linq.XElement.Load(XmlReader reader, LoadOptions options)
   at System.Xml.Linq.XElement.Parse(String text, LoadOptions options)
   at MSHelpSystem.Controls.TocEntry.<.ctor>b__3_0(Object _, DownloadStringCompletedEventArgs e)
   at System.Net.WebClient.OnDownloadStringCompleted(DownloadStringCompletedEventArgs e)
   at System.Net.WebClient.DownloadStringOperationCompleted(Object arg)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

---- Post-error application state information:
Installed 3rd party AddIns:
ProjectService.CurrentSolution: <null>
ProjectService.CurrentProject: <null>
Workbench.ActiveContent: MSHelpSystem.Controls.Help3TocPad