Are you trying to save the file on network destination such as mounted server? Or on the local machine itself?
Does it happen on Save or SaveAs or both?
Are you able to export a PDF out of this document?Georg Lulich supported this idea ·Georg Lulich commented
I can't save anything in InDesign anymore. Get the message the document is "damaged" Failure code 0 or 1. The same happens when I try to Save as och Save a copy. I deleted the application (including the preferences) completely , downloaded it and installed again – no difference. I tried to create a new document as well, without mounting or writing anything in it – the same result. Mac 27" 2013, Mojave, latest InDesign from the Cloud.