Deserialize JSON throws Error on Launch -'Exception has been thrown by the Target of an Invocation'

Deserialize JSON throws Error on Launch -‘Exception has been thrown by the Target of an Invocation’

Tried different versions of UiPath.WebAPI.Activities but the same error.

@Syed_genius,

Check if you are getting JSON value or not.
You can click on Details on the error popup and share. Also if possible share the JSON to check.

Hi @Syed_genius

Could you please post here the entire error stack by using the Copy to Clipboard button?

22.10.5+Branch.support-v22.10.Sha.79bc7c61a909d990afd07620b3005b3a35eb1f1b

Exception has been thrown by the target of an invocation.

Error: System.Exception: Exception has been thrown by the target of an invocation.
—> System.Exception: Could not load type ‘System.Activities.ViewModels.Interfaces.IBusyService’ from assembly ‘System.Activities.ViewModels, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null’.
at UiPath.Web.Activities.ViewModels.DeserializeJsonViewModel1..ctor(IDesignServices services) --- End of inner exception stack trace --- at System.RuntimeMethodHandle.InvokeMethod(Object target, Span1& arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object parameters, CultureInfo culture)
at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object args, CultureInfo culture)
at System.Activator.CreateInstance(Type type, Object args)
at UiPath.Studio.Plugin.Workflow.Presentation.ActivityViewModelService.CreateViewModel(ModelItem modelItem)
at UiPath.Studio.Plugin.Workflow.Presentation.ActivityViewModel.ConnectWithMetadata()
at UiPath.Studio.Plugin.Workflow.Presentation.ActivityViewModel.ConnectAsync(ModelItem modelItem)
at UiPath.Studio.Plugin.Workflow.Presentation.DefaultActivityDesigner.OnDataContextChanged(Object sender, DependencyPropertyChangedEventArgs e)
at System.Threading.Tasks.Task.<>c.b__128_0(Object state)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler), HResult -2146232828

Studio version : 2022.10.5
UiPath.webapi.activities : 1.21.1

1 Like

Thank you!

We retested this and you will need to:

  • update to the latest System package (to either 24.10.7 or 24.12.1-preview)
  • update to the latest Studio patch version 2022.10.16

This should fix the issue.