An Error Occur on Wait and Resume for Form Task Activity

[tzekailim (Tze Kai)]

Hi,

I’m having some issue with the Wait for Form Task and Resume activity, every time I ran it, it gave me the following error:

RemoteException wrapping System.Runtime.Serialization.InvalidDataContractException: Type ‘System.Collections.IEnumerable’ cannot be serialized. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want serialized with the DataMemberAttribute attribute. If the type is a collection, consider marking it with the CollectionDataContractAttribute. See the Microsoft .NET Framework documentation for other supported types. at System.Runtime.AsyncResult.End[TAsyncResult](IAsyncResult result) at System.Activities.WorkflowApplication.IdleEventHandler.OnStage2Complete(IAsyncResult lastResult, WorkflowApplication instance, Boolean isStillSync) at System.Activities.WorkflowApplication.EventFrame(IAsyncResult result)

I went to check out some of the old posts and tried their methods but still does not work.

Wait and Resume For All Tasks Throwing InvalidDataContractException

Hi, Trying to use “Wait for all form task completion.xaml” snippet. It is able to create all the tasks but when it is coming to second loop where it should execute “Wait and Resume For All Tasks” loop, it is throwing below error- Message: Type ‘Newtonsoft.Json.Linq.JToken’ is a recursive collection data contract which is not supported. Consider modifying the definition of collection ‘Newtonsoft.Json.Linq.JToken’ to remove references to itself. Exception Type: System.Runtime.Serialization.Inva…

[supermanPunch (Arpan)]

Hi @tzekailim ,

Can you make sure the Persistence Activities Package are installed ?

And also make sure the Supports Persistence is enabled in the Project Settings.

Also have a look on the Below Documentation where the Best practices for an Orchestration Processes are mentioned.

Orchestration Process

[tzekailim (Tze Kai)]

I’ve done all of that already, but it still does not work😅. @supermanPunch

[supermanPunch (Arpan)]

@tzekailim

RemoteException wrapping System.Runtime.Serialization.InvalidDataContractException: Type ‘System.Collections.IEnumerable’ cannot be serialized

@tzekailim

Ok. Let’s move into the error that you are facing.

Do you have an IEnumerable or a Collection Type of variable under the Scope that is same Scope as that of Wait and Resume Form Task Activity ?

[MigT (Miguel Thibaut)]

Hi @tzekailim,

Do you find any solution to your problem? Because we are facing to the same issue so we are interresting to know with my team.

Thanks

[tzekailim (Tze Kai)]

Nope, I put it on hold till someone has solution to it.

[rcu.ted.miller (Ted Miller)]

In case anyone finds this hint useful, I had this error coming up in my first attempt at a parallel for each process as well.

I’ll qualify this with… I’m new to UiPath and by no means a sw developer so this might have been a silly rookie mistake that others wouldn’t make but since my reading of all the posts about this didn’t provide an obvious answer and in the spirit of being helpful I thought I’d share my silly mistake

The issue I was having was self induced by including the Action Center steps within my validation loop to check confidence levels.

Solution was, within my loop looking for “confidence is blank or less than our threshold”, when the logic fails, set a “needs help” variable to true and break the loop. After the loop, when “needs help” variable is true, create the action center record and wait for a response.