When trying to save a document i get this message:
Error saving the document Untitled1:
Nonexistent object.
Path to the file does not exist.
Happens with both Writer and Calc
This isn’t an answer, but a prompt for more info. I see this kind of thing when I’m on Ubuntu trying to save on a Windows Share drive. What’s your environment? All on a single OS or machine? or networked? On Win or Linux? Which version of LibreOffice?
This answer/query specifies the same message. I imagine this is another GVFS issue that has been resolved in this thread. As @dajare mentions though you need to provide more detail.