Develop/fixes/td 574 console 405 error on confirm nominated supervisor

DigitalLearningSolutions.Web/Controllers/SupervisorController/Supervisor.cs

@@ -917,6 +917,14 @@ public IActionResult NominateSupervisor(int supervisorDelegateId, ReturnPageQuer
             var superviseDelegate =
                 supervisorService.GetSupervisorDelegateDetailsById(supervisorDelegateId, GetAdminID(), 0);
             var model = new SupervisorDelegateViewModel(superviseDelegate, returnPageQuery);
+            if (TempData["NominateSupervisorError"] != null)
+            {
+                if (Convert.ToBoolean(TempData["NominateSupervisorError"].ToString()))
+                {
+                    ModelState.AddModelError("ActionConfirmed", "Please tick the checkbox to confirm you wish to perform this action");
+
+                }
+            }
             return View("NominateSupervisor", model);
         }
         [HttpPost]
@@ -939,7 +947,9 @@ public IActionResult ConfirmNominateSupervisor(SupervisorDelegateViewModel super
             }
             else
             {
-                return View("NominateSupervisor", supervisorDelegate);
+                TempData["NominateSupervisorError"] = true;
+                return RedirectToAction("NominateSupervisor", new { supervisorDelegateId = supervisorDelegate.Id, returnPageQuery = supervisorDelegate.ReturnPageQuery });
+
             }
         }
     }

DigitalLearningSolutions.Web/Views/Supervisor/NominateSupervisor.cshtml

@@ -5,7 +5,7 @@
 @{
     var errorHasOccurred = !ViewData.ModelState.IsValid;
     ViewData["Application"] = "Supervisor";
-    ViewData["Title"] = (errorHasOccurred ? "Error: " : "") + "Confirm Nominated supervisor";
+    ViewData["Title"] = "Confirm Nominated supervisor";
     ViewData["HeaderPath"] = $"{Configuration["AppRootPath"]}/Supervisor/MyStaff";
     ViewData["HeaderPathName"] = "My Staff";
 }