Question from current customer:

Using: SP 2013

"I just updated to your May 2017 release of Workflow, and I'm trying to turn on Nintex Live for the first time. I got this error when attempting to Enable Nintex Live for Nintex Workflow in the Live and external setttings:

Sorry, something went wrong: An object of the type Microsoft.SharePoint.Administration.SPWebConfigJobDefinition named "job-webconfig-modification" already exists under the parent Microsoft.SharePoint.Administration.SPWebService named "". Rename your object or delete the existing object."

What you need to know:

The error means there is a web config modification job.  These will be created when the solutions are being deployed. These errors can happen if there is currently another job modifying the web config file (another solution in process of deploying) or if there is something wrong with the server it is trying to deploy to (job gets stuck, so nothing else will move through).