TF250001: The validation check failed for the following account: NT AUTHORITY\NETWORK SERVICE

While creating new Team Project Collection in Team Foundation Server, if you receive error for SharePoint, make sure that you have added NT AUTHORITY\NETWORK SERVICE as farm administrator in your SharePoint central administration site for Team Foundation Server.

I got this error.

"[Error] TF252031: A SharePoint site could not be created for the team project collection. The following error occurred: TF250001: The validation check failed for the following account: NT AUTHORITY\NETWORK SERVICE. The account must be a member of the Farm Administrators group for the following SharePoint Web application: http://test-tfs-srv01:9000/. For more information, see the Microsoft Web site (http://go.microsoft.com/fwlink/?LinkId=161206)."

After adding "NT AUTHORITY\NETWORK SERVICE" as farm administrator, team project collection got created successfully.

Deleting a TFS Task

If you need to delete a TFS task, run this command,
witadmin.exe destroywi /Collection:<TFS url> /id:<Task id>
where TFS url == Team Project Collection URL  &
Task id == Task ID that is assigned by TFS
In this case, I am deleting a task with ID 31 where URL of project collection is “http:\\test-tfs-srv01:8080\tfs\DefaultCollection”