Getting an Error in my event log of Team Foundation Server

Question

I don't know if this is the right place to ask this, but I'm getting an error in my eventlog every time I open my TFS webpage I get the following error:

<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Team Foundation Server" Guid="{80761876-6844-47D5-8106-F8ED2AA8687B}" /> 
<EventID>0</EventID> 
<Version>0</Version> 
<Level>2</Level> 
<Task>1</Task> 
<Opcode>10</Opcode> 
<Keywords>0x8000000000000001</Keywords> 
<TimeCreated SystemTime="2016-02-24T14:48:40.361409100Z" /> 
<EventRecordID>650</EventRecordID> 
<Correlation ActivityID="{72451AFD-6F04-0000-3340-4572046FD101}" /> 
<Execution ProcessID="3932" ThreadID="808" /> 
<Channel>Microsoft-Team Foundation Server/Debug</Channel> 
<Computer>WIN-U8K4FA701IJ</Computer> 
<Security UserID="S-1-5-19" /> 
</System>
<UserData>
<Info TraceId="{00000001-0001-0001-0000-000000000000}" xmlns="http://schemas.microsoft.com/TeamFoundation/2010/Framework">
 <Tracepoint>599999</Tracepoint> 
 <ServiceHost>{00000000-0000-0000-0000-000000000000}</ServiceHost> 
 <ContextId>0</ContextId> 
 <ProcessName>w3wp</ProcessName> 
 <Username /> 
 <Service /> 
 <Method /> 
 <Area>WebAccess</Area> 
 <Layer>Controller</Layer> 
 <UserAgent /> 
 <Uri /> 
 <Path /> 
 <UserDefined /> 
 <Message>System.Reflection.ReflectionTypeLoadException: Kan een of meer van de gevraagde typen niet laden. Haal de LoaderExceptions-eigenschap op voor meer informatie. bij System.Reflection.RuntimeModule.GetTypes(RuntimeModule module) bij System.Reflection.RuntimeModule.GetTypes() bij System.Reflection.Assembly.GetTypes() bij Microsoft.TeamFoundation.Server.WebAccess.TypeUtils.GetAllTypes(IEnumerable`1 assemblies, Func`2 filter)</Message> 
</Info>
</UserData>
</Event>

I tried re-installing everything but it didn't bother. Who knows what is giving me this error?

Answer 1

First, translate the error message into English to make it readable:

<Message>System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
   at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module)
   at System.Reflection.RuntimeModule.GetTypes()
   at System.Reflection.Assembly.GetTypes()
   at Microsoft.TeamFoundation.Server.WebAccess.TypeUtils.GetAllTypes(IEnumerable`1 assemblies, Func`2 filter)</Message>

This error may be caused by various factors, for example, if you don't configure build service well. Try to install the TFS 2012 Power Tools, then run the BPA to scan your TFS 2012 Server, you may get something useful.