can not save


I have a large document with pictures in it and I add few pages with pictures at the end of the document once in awhile. I am using Ubuntu 17.10. Before I upgraded to 17.10 everything was working without any problem. Now, when I tried to add few pages to this document and save it I got an error message stating “Saving the document Write error Error in writing sub-document content.xml” . I checked other documents and they save. I saved this large document as a doc file and added the extra pages then saved it as a doc file and it worked. When I opened the doc file and tried to save it as odt file I got the same error message. How can I solve this problem?

Many thanks for the hepl and best regards.