System.NullReferenceException: Object reference not set to an instance of an object.
   at Wandelknooppunt2020.Controllers.RouteplannerController.Nodes(String parameter1, String parameter2, String parameter3, Int32 parameter4) in C:\Users\Nijss\Source\Repos\Wandelknooppunt2020\Wandelknooppunt2020\Controllers\RouteplannerController.cs:line 441