Funktion nicht verfügbar

Object reference not set to an instance of an object.

Vielen Dank für Ihr Verständnis.
at RaiffeisenRelaunch.Controllers.NewsController.GetNewsForSymbolPartialViewModelCollection(IClient symbolsClient) in c:\TeamCity\buildAgent\work\RaiffeisenRelaunch_Staging\RaiffeisenRelaunch\Code\Controllers\NewsController.cs:line 288 at RaiffeisenRelaunch.Controllers.NewsController.GetNewsForSymbol(String symbol, Nullable`1 page, Boolean getArbitrageList) in c:\TeamCity\buildAgent\work\RaiffeisenRelaunch_Staging\RaiffeisenRelaunch\Code\Controllers\NewsController.cs:line 143 at lambda_method(Closure , ControllerBase , Object[] ) at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass15.<InvokeActionMethodWithFilters>b__12() 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.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.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)