Exception while fetching payload paths using ResourceCollectionHelper.getPaths(path, rcCollections)

I'm trying to fetch active workflows in the instances and their payload but some paths are /var/workflow/packages/generated-package80 so I've used 

for getting the content and other associated paths in the package, the above method is working as expected and returns path in WorkFlowProcess. But In Scheduler, I've used the same approach for getting actual payload path from '/var/workflow/packages/generated-package80' but it returns an exception like "Cannot build path list out of the resource collection ".

Need some suggestions to resolve this or Can I use Node Iteration approach?

Hopefully someone can give me some suggestions. thanks