When saving the document is said "not to exist"

Question

I have been unable to save new documents when working in pages. A dialogue box states "the page does not exist".

Answer 1

Hi  Bhaskar,
Thank you for your posting!
According to your description, my understanding for your scenario is :
In your document library require check out documents before editing Setting  is not enabled and there is no required field;
when user save the document, the document still checkout ;
Still require documents to be checked out before they can be edited.
In my test, when user edit the checked out document and save it , the office will pop up a window as this:
If we select Yes, the document will be Checked in; If we select No, the document will be still Checked out.
For narrowing down your issue,  I need to clarify some information:
How about  creating  a new document library?
Does the issue appear for all the document  in the library?
Also for making sure disabling require check out documents before editing Setting , you can try to use PoerShell:
Change SharePoint list settings using PowerShell - Part 1: General and Versioning
Thank you for your understanding and support.
Best Regards,
Eric
Eric Tao
TechNet Community Support