A second operation started on this context before a previous operation completed. This is usually caused by different threads using the same instance of DbContext. For more information on how to avoid threading issues with DbContext, see https://go.microsoft.com/fwlink/?linkid=2097913.
The process cannot access the file 'D:\vhosts\quickchangecenter.com\fitesthetic.com\wwwroot\sitemap.xml' because it is being used by another process.