User Account made website unavailable

So , I replaced an employee recently in my organisation . her user account was deleted by the helpdesk admin. Now since her account is deleted , the website is unavailable. it looks like there was something in that folder to make the page run.

Is there anything I can tell the admin team to do . Website is off since 2 days.

It is an asp.net application. when I tried to trace the error , it showed C;/Users/guesty/blah blah/local.aspx.cs.

I cant find anything wrong with the local.aspx.cs