I could use some help please, I have a customer who have Nintex Forms & Workflow 2013. Everything has been running smoothly for a couple of years but just in the last few months on some list items it wont open the Nintex form, I just get a correlation id to refer to. When I look in the ULS logs there are messages saying that "the item does not exist, it may have been deleted by another user".
However we can see the item in the list, and can edit via quick edit. Any ideas?
Does the form have a People Picker control on it?
If so does the Person/Group column in SharePoint that it is connected to have a person that is no longer with the company?
If so, if you change the name in Grid View to a user that is still at the company does that resolve the issue?
If that is not the issue have a look for any special characters in the current meta data for the items that do not open and see if the items that do open have the same characters or not.