Error while saving a file

Could you guys help me out with this error I'm trying to save a file on to the server but I can't because it's throwing me this error , I have to download file to my local machine from the server and upload it

Please post a screenshot of your WinSCP editor preferences for Sublime:
https://winscp.net/eng/docs/ui_editor_preferences

here's the screenshot

Thanks. But that's not the window I have asked for.
Select "Sublime_text", and click Edit:
https://winscp.net/eng/docs/ui_editor_preferences

Hey,so sorry

You need to turn off the "External editor opens each file in separate window (process)" as I believe that Sublime is a tabbed editor, right?

Yes Thank you very much @martin, it worked.