In a list of SP2016 site one user is not able to save the add new item form. User is getting :
The server was unable to save the format this time. Please try again
Previously user was able to add items. The list has no unique permission and user has edit permission on site. Meanwhile other users are able to add entries.
UPDATE : When user is trying to edit the existing item and save, it is giving
access is denied. You don't have permission to perform this action or access the resource
Any leads please.