Main Flow Chart: Sequence Contains No Elements

[hammy (Austin)]

Hello!
I created an automation a couple of days ago that was working great, even uploaded it to orchestrator and was able to run it. However, I needed to make a quick edit and now nothing is working.
The only change I made was to a couple of variables (just a file path), now I’m getting the error “Main Flowchart: Sequence contains no elements”. Total error statement below.
I tried a restart. I tried reverting all my changes and had no luck. I tried opening a new project and copying everything over with the old variables and still no dice.

RemoteException wrapping System.InvalidOperationException: Sequence contains no elements
at System.Linq.ThrowHelper.ThrowNoElementsException()
at System.Linq.Enumerable.First[TSource](IEnumerable1 source) at Namespace_481e.Main_Expressions.Main_Expressions_TypedDataContext2_ForReadOnly.__Expr0Get() at Namespace_481e.Main_Expressions.Main_Expressions_TypedDataContext2_ForReadOnly.ValueType___Expr0Get() at Namespace_481e.Main_Expressions.InvokeExpression(Int32 expressionId, IList1 locations,
ActivityContext activityContext)
at System.Activities.Expressions.CompiledExpressionInvoker.InvokeExpression(ActivityContext activityContext)
at Microsoft.VisualBasic.Activities.VisualBasicValue1.Execute(CodeActivityContext context) at System.Activities.CodeActivity1.InternalExecuteInResolutionContext(CodeActivityContext context)
at System.Activities.Runtime.ActivityExecutor.ExecuteInResolutionContext[T](ActivityInstance parentInstance,
Activity1 expressionActivity) at System.Activities.Variable1.PopulateDefault(ActivityExecutor executor,
ActivityInstance parentInstance,
Location location)
at System.Activities.ActivityInstance.ResolveVariable(Variable variable,
ActivityExecutor executor)
at System.Activities.ActivityInstance.ResolveVariables(ActivityExecutor executor)
at System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor executor,
BookmarkManager bookmarkManager,
Location resultLocation)

[fernando_zuluaga]

Hey

can you try this?

"Sequence contains no matching element" when typing an opening brace

Interestingly enough, I opened another project and the error did not manifest there. I then went back to the project where I had originally noticed the popup the but it didn’t appear anymore. So, opening another project seems to have fixed the issue. Very strange.

Regards

[hammy (Austin)]

Thanks for the quick reply. Tried opening a couple of different projects and going back to the problem one - no changes.

[Anil_G (Anil Gorthi)]

@hammy

Canyou try closing the project and then rename the project.json to project_old.json and reopen the project…

Also alternately once reopened please temove the connections and re add them

Cheers

[hammy (Austin)]

Thanks for the suggestion!
Oddly enough, every time I open the project after changing the name of the file, it simply creates another project.json text file.

Tweaking the connectors didn’t do anything, perhaps as a result of the project.json file being created again.

[Anil_G (Anil Gorthi)]

@hammy

json

@hammy

The whole purpose of renaming project.json is to recreate it fresh if it had any issues

Now can you try changing the system activities package to any other version or upgrade to latest version

cheers

[postwick (Paul)]

@hammy

every time I open the project after changing the name of the file, it simply creates another project.json text file.

That’s the point.

But you’ll lose some things - like the packages (dependencies) you had installed - so you may run into other issues.

[hammy (Austin)]

I see, thanks for explaining.
I’ve downgraded packages, particularly the system activities package, tried to debug and got the same error. I reupgraded them and still same error.

[Anil_G (Anil Gorthi)]

@hammy

can you try replacing all your inverted comma(don’t copy…delete and re add) you used in variables/arguments

and also delete the connection from start and re add it

or if you can attach the whole process here I can check from my side as well

cheers

[hammy (Austin)]

I found the issue after doing more step-by-step troubleshooting
It was related to one specific variable where the element did not exist for that variable. Unfortunately, it didn’t specify the variable was the problem in any error messages.