შეცდომაა

System.ArgumentException: Value cannot be null or empty. Parameter name: contentType at System.Web.Mvc.FileResult..ctor(String contentType) at System.Web.Mvc.FileContentResult..ctor(Byte[] fileContents, String contentType) at System.Web.Mvc.Controller.File(Byte[] fileContents, String contentType, String fileDownloadName) at EiecSiteUser.Controllers.ServicesController.GetCoursePhoto(Int32 courseId, String who) in C:\Users\Lela.Papava\Source\Repos\EiecSiteUser 22.08.2025\EiecSiteUser\Controllers\ServicesController.cs:line 70