Fix blazorise errors

src/EventHub.Admin.Web/Components/UserPicker/UserPicker.razor.cs

@@ -120,9 +120,10 @@ namespace EventHub.Admin.Web.Components.UserPicker
             await SaveFormAsync.InvokeAsync();
         }
 
-        private void ClosingUserPickerModal(ModalClosingEventArgs eventArgs)
+        private Task ClosingUserPickerModal(ModalClosingEventArgs eventArgs)
         {
             eventArgs.Cancel = eventArgs.CloseReason == CloseReason.FocusLostClosing;
+            return Task.CompletedTask;
         }
     }
 }

src/EventHub.Admin.Web/Pages/EventManagement.razor.cs

@@ -102,9 +102,10 @@ namespace EventHub.Admin.Web.Pages
             EditEventModal.Show();
         }
 
-        private void OnEditModalClosing(CancelEventArgs e)
+        private Task OnEditModalClosing(CancelEventArgs e)
         {
             SelectedTabInEditModal = EventEditTabs.EventInfo.ToString();
+            return Task.CompletedTask;
         }
 
         private void OnSelectedTabChangedInEditModal(string name)

src/EventHub.Admin.Web/Pages/OrganizationManagement.razor.cs

@@ -153,10 +153,11 @@ namespace EventHub.Admin.Web.Pages
             SelectedTabInEditModal = name;
         }
 
-        private void OnEditModalClosing(CancelEventArgs e)
+        private Task OnEditModalClosing(CancelEventArgs e)
         {
             IsLoadingProfileImage = false;
             SelectedTabInEditModal = TabContentInEditModal.OrganizationProfile.ToString();
+            return Task.CompletedTask;
         }
 
         private async Task OnKeyPress(KeyboardEventArgs e)