When they updated the forum, tons of old links to the original forums (so, two updates ago) all but vanished. I have found a cahced version of the forum question you are searching for, but it’s formatting is totally messed up because it has no css / image files being applied to it (because they are now all gone!). 

Here’s the google cached version of the page: https://webcache.googleusercontent.com/search?q=cache%3ARr4EidVq_TYJ%3Ahttps%3A%2F%2Fcommunity.nintex.com%2Ft5%2FNintex-for-SharePoint-Forum%2FError-operating-on-collection-variable-advice-on-date-triggered%2Fm-p%2F119361&cd=2&hl=en&ct=clnk&gl=us

If that doesn’t help you then please just ask the question here outright

Hello SherriTaylor

Our community team is actively working on improving the search feature with assistance from the platform vendor. We are also actively updating Google Search Indexes, which should redirect you to the correct content.

In some instances, content has not migrated properly, and is thus not appearing on the community search.

Please know we are working on resolving these issues with the highest priority and we apologize for the frustration this has caused.

I have found another cached version of the article you are looking for here, but unfortunately there are no images shown: 
https://web.archive.org/web/20210928171448/https://community.nintex.com/t5/Nintex-for-SharePoint-Forum/Error-operating-on-collection-variable-advice-on-date-triggered/td-p/119342

If this does not solve your question, please ask a new one in this community. 

Best regards
Community team