Value can not be null Parameter Name:store TFS WorkItem Store Error

Error HRESULT E_FAIL has been returned from a call to a COM component.

Description:
System.Runtime.InteropServices.COMException (0x80004005): Error HRESULT E_FAIL has been returned from a call to a COM component.
   at Microsoft.TeamFoundation.WorkItemTracking.Client.DataStore.DataStoreNative.UpdateMetadata(IntPtr handle, Object rowset, String dbstamp, UInt32& changes)
   at Microsoft.TeamFoundation.WorkItemTracking.Client.DataStore.Datastore.UpdateMetadata(Object rowset, String dbstamp)
   at Microsoft.TeamFoundation.WorkItemTracking.Client.WorkItemStore.EndBackendCall(BackendCallData data)
   at Microsoft.TeamFoundation.WorkItemTracking.Client.WorkItemStore.RefreshCacheInternal(BackendCallData& data)
   at Microsoft.TeamFoundation.WorkItemTracking.Client.WorkItemStore.InitializeInternal()
   at Microsoft.TeamFoundation.WorkItemTracking.Client.WorkItemStore.Microsoft.TeamFoundation.Client.ITfsTeamProjectCollectionObject.Initialize(TfsTeamProjectCollection teamProjectCollection)
   at Microsoft.TeamFoundation.Client.TfsTeamProjectCollection.InitializeTeamFoundationObject(String fullName, Object instance)
   at Microsoft.TeamFoundation.Client.TfsConnection.CreateServiceInstance(Assembly assembly, String fullName)
   at Microsoft.TeamFoundation.Client.TfsConnection.GetServiceInstance(Type serviceType, Object serviceInstance)
   at Microsoft.TeamFoundation.Client.TfsTeamProjectCollection.GetServiceInstance(Type serviceType, Object serviceInstance)
   at Microsoft.TeamFoundation.Client.TfsConnection.GetService(Type serviceType)
   at Microsoft.TeamFoundation.Client.TfsConnection.GetService[T]()

If you have already installed TFS Client SDK and successfully executing on localhost.You have to add below tags in your web.config to run you website/web api on remote host.

<configuration>

<startup useLegacyV2RuntimeActivationPolicy="true">

              <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>

       </startup> 

</configuration>

Hope this will resolve your issue.....

Enable 32 bit Applications Azure Cloud Service Hosting automation

Sometime dll issues occured on IIS based on 32-bit or 64-bit dlls.Error occured like below

Could not load file or assembly 'Microsoft.TeamFoundation.WorkItemTracking.Client.DataStoreLoader' or one of its dependencies. An attempt was made to load a program with an incorrect format.

If you have already reference with microsoft.TeamFoundation.WorkItemTracking.Client.DataStoreLoader.dll or respective dll and its dependencies. 

Then it may be error due to 32-bit applications disabled on IIS.

To resolve this error, you can set it manually from IIS.

If you need hosted a site again and again. It will be time consuming to enable it.

To automate this, create a startup script with the below given commands

%windir%\system32\inetsrv\appcmd set config -section:system.applicationHost/applicationPools

Save as this line to “setup.bat”.

Then include this file into your project, set "copy local"=true.

Open your ServiceDefinition.csdef and add below lines as in snapshot.

<webrole >

     <Startup>

              <Task commandLine="setup.cmd" executionContext="elevated" />

          </Startup>

</webrole >