Invoke code "Could not find a part of the path" - Xaml is in the current folder project

@alexandru thanks, this way it works

That activitie ‘Espera algum dos textos…’ is a library I’ve created, and it uses Parallel For Each as you mentioned. Actually it doesn’t change any directory path but, may the way parallel is interpreted during execution has something to do with this behavior ?!

Well, thanks for the support!