While working with simple custom list,we tried to add the data in to the list,suddenly we got an error saying that "The server was unable to save the form at this time. please try again." as shown in fig below.
To solve this issue we have to restart "SharePoint Search Host Controller", its working now. I was able to add items in list.
For reference check the following links.
http://sharepointerthilosh.blogspot.in/2013/03/the-server-was-unable-to-save-form-at.html
http://onceinawhilescribble.blogspot.in/2013/09/when-creating-folder-in-library-server.html
http://onceinawhilescribble.blogspot.in/2013/09/when-creating-folder-in-library-server.html