I have an update item in my training course registration that updates a Look Up list that lists the start and end dates of the courses, and the spaces allocated to each course. It then does a calculation to provide the Dates and spaces available in another column in the same look up.

all the error say is go to this article which tell me nothing really Workflow fails to update item - Nintex Community

I've probably got the configuration wrong somewhere but I think its claiming to not see something in the look up which when I check, everything I need is there

stumped

Mark