Clicking on Wishilist button crashes application

[hoverkw]

Error code below

System.NotImplementedException
HResult=0x80004001
Message=The method or operation is not implemented.
Source=csApiApp
StackTrace:
at csApiApp.Mvvm.Vm.BaseVm.AddToWishlist() in C:!Moje\git\BeeliveryAcademy\T4app\CheapShark Project\csApiApp-master\csApiApp\csApiApp\Mvvm\Vm\BaseVm.cs:line 113
at FunctionZero.CommandZero.CommandBuilder.<>c__DisplayClass14_0.b__0(Object o)
at FunctionZero.CommandZero.CommandZeroAsync.d__29.MoveNext()