Resaving Events Entries failed This question is identical to Resaving blog entries keeps failing except that I'm not finding any [error] or [warning] in my log entries. 

I have changed my entry URL format for the section named Events from

{mainCategory.last().uri}/{slug}


to

{mainCategory.last().uri}/_entry


as described here: Is it possible to view 'Expired' entrys on the front end? and when I hit save on the section page, then it immediately gives the failed task: Resaving Events entries. Any thoughts?

UPDATE

OK, I did find this error:
2016/12/18 02:26:41 [error] [application] Encountered an error running task 422 (ResaveElements), step 2 of 197: Encountered the following validation errors when trying to save entry element "Transforming Work" with the ID "19":
 - URI "fort-collins/weekly/buddhist-meditation-classes/_entry" has already been taken.

I'm not sure quite what it means. There's only one entry named Transforming Work.
There's only one entry named Transforming Work.


That might be true, but you’re telling Craft to store the entry with an URI

fort-collins/weekly/buddhist-meditation-classes/_entry


Change your entry URI format back to something that’s going to be unique for each entry, probably you’ll want to replace the hardcoded string _entry with the dynamic variable {slug} again, or better, do what is actually described in that Stack Exchange answer you linked to and don’t use the default Entry routing at all (disable “Entries in this section have their own URLs”) and rebuild the route with a custom one (see the Craft docs on Dynamic Routes).