Providing wrong AggregateRootId gives confusing exception (Non-Static method requires a target)

[nour-s]

When you call a command with wrong AggregateRootId (I mean doesn't exists in the EventSource database), an exception of System.Reflection.TargetException occures.
Here is the problem :
Stack trace
at System.Reflection.RuntimeMethodInfo.CheckConsistency(Object target)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
at Ncqrs.Commanding.CommandExecution.Mapping.Attributes.MapsToAggregateRootMethodAttributeHandler.<>c__DisplayClass3.b__0(AggregateRoot agg, ICommand cmd) in C:\Projects\ncqrs-ncqrs-ed26668\Framework\src\Ncqrs\Commanding\CommandExecution\Mapping\Attributes\MapsToAggregateRootMethodAttributeHandler.cs:line 21
at Ncqrs.Commanding.CommandExecution.Mapping.UoWMappedCommandExecutor.UoWMappedCommandExecutorCallbacks.ExecuteActionOnExistingInstance(Func2 idCallback, Func2 typeCallback, Action2 action) in C:\Projects\ncqrs-ncqrs-ed26668\Framework\src\Ncqrs\Commanding\CommandExecution\Mapping\UoWMappedCommandExecutor.cs:line 37 at Ncqrs.Commanding.CommandExecution.Mapping.Attributes.MapsToAggregateRootMethodAttributeHandler.<>c__DisplayClass3.<Map>b__2() in C:\Projects\ncqrs-ncqrs-ed26668\Framework\src\Ncqrs\Commanding\CommandExecution\Mapping\Attributes\MapsToAggregateRootMethodAttributeHandler.cs:line 24 at Ncqrs.Commanding.CommandExecution.Mapping.Attributes.MapsToAggregateRootMethodAttributeHandler.Map(MapsToAggregateRootMethodAttribute attribute, ICommand command, IMappedCommandExecutor executor) in C:\Projects\ncqrs-ncqrs-ed26668\Framework\src\Ncqrs\Commanding\CommandExecution\Mapping\Attributes\MapsToAggregateRootMethodAttributeHandler.cs:line 33 at CallSite.Target(Closure , CallSite , Object , Object , ICommand , IMappedCommandExecutor ) at System.Dynamic.UpdateDelegates.UpdateAndExecuteVoid4[T0,T1,T2,T3](CallSite site, T0 arg0, T1 arg1, T2 arg2, T3 arg3) at Ncqrs.Commanding.CommandExecution.Mapping.Attributes.AttributeBasedCommandMapper.Map(ICommand command, IMappedCommandExecutor executor) in C:\Projects\ncqrs-ncqrs-ed26668\Framework\src\Ncqrs\Commanding\CommandExecution\Mapping\Attributes\AttributeBasedCommandMapper.cs:line 59 at Ncqrs.Commanding.CommandExecution.Mapping.UoWMappedCommandExecutor.ExecuteInContext(IUnitOfWorkContext context, ICommand command) in C:\Projects\ncqrs-ncqrs-ed26668\Framework\src\Ncqrs\Commanding\CommandExecution\Mapping\UoWMappedCommandExecutor.cs:line 17 at Ncqrs.Commanding.CommandExecution.CommandExecutorBase1.Execute(TCommand command) in C:\Projects\ncqrs-ncqrs-ed26668\Framework\src\Ncqrs\Commanding\CommandExecution\CommandExecutorBase.cs:line 53
at Ncqrs.NServiceBus.NsbCommandService.b__0(ICommand x)
at Ncqrs.Commanding.ServiceModel.CommandService.Execute(ICommand command) in C:\Projects\ncqrs-ncqrs-ed26668\Framework\src\Ncqrs\Commanding\ServiceModel\CommandService.cs:line 63
at Ncqrs.NServiceBus.NcqrsMessageHandler.Handle(CommandMessage message)

The problem begins in UoWMappedCommandExecutor class in the method (ExecuteActionOnExistingInstance)
in the following line:
var aggRoot = _uow.GetById(type, id, _command.KnownVersion);

aggrRoot is null !! because the id passed value is wrong
so the next line :
action(aggRoot, _command)
will fail.

it tooks me one hour to find out what the problem is.