System.NullReferenceException: Object reference not set to an instance of an object.
   at MuM.Feature.Events.Controllers.Content.EventSearchController.ModifySwitzerlandDropDown(Dictionary`2 countryDictionary) in D:\a\1\s\src\Feature\Events\code\Controllers\Content\EventSearchController.cs:line 269
   at MuM.Feature.Events.Controllers.Content.EventSearchController.GetFilterValues(EventSearchViewModel viewModel) in D:\a\1\s\src\Feature\Events\code\Controllers\Content\EventSearchController.cs:line 252
   at MuM.Feature.Events.Controllers.Content.EventSearchController.CreateViewModel(EventSearchFilter userFilter) in D:\a\1\s\src\Feature\Events\code\Controllers\Content\EventSearchController.cs:line 118
   at MuM.Feature.Events.Controllers.Content.EventSearchController.Index(EventSearchFilter userFilter) in D:\a\1\s\src\Feature\Events\code\Controllers\Content\EventSearchController.cs:line 49
   at lambda_method(Closure , ControllerBase , Object[] )
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass24_0.<InvokeActionMethodWithFilters>b__0()
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
   at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)