Error.

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Object reference not set to an instance of an object.

at Faculty_Admin_Application.Controllers.PMUStaffsController.<>c__DisplayClass3_1.<Details>b__1(StaffAttachementVM x) in E:\PMU\Faculty-Admin\Faculty-Admin-Application\Controllers\PMUStaffsController.cs:line 83 at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source, Func`2 predicate) at Faculty_Admin_Application.Controllers.PMUStaffsController.Details(String id) in E:\PMU\Faculty-Admin\Faculty-Admin-Application\Controllers\PMUStaffsController.cs:line 83