I would like to change the premission on a certain folder in the same library that the Nintex workflow is running.

That is why I used: Nintex set item permission encoded absolute url (and not current item)
The url is correct (I’m admin), but the system workflow gives the following error: 
“Error setting item permissions. Cannot find list item in list '00Quality(DEV)' to match the specified criteria. The item does not exist or the user does not have sufficient permissions.”

I do not have this error when I use current item. So how can I solve this?