The workaround is to delete the graph with the embedded nontable. Prism is confused with a graph that has an embedded data table with no data, and gives the "Cannot save file" message. Now go remove the data from the data table, and try to save the file. Copy some results from a table and paste on the graph. We know of one problem in Prism 6.00 to 6.04 that caused this problem. Does that help? If not, turn those options back on. Go to the File&Printer tab of the Preferences file, and turn off the options for automatic file saving. Is the problem with saving a backup copy of the file? When the path or file name contain other characters, Prism 6 gives a generic "unable to open file" message (fixed in Prism 7). Prism Windows can only handle a path and file name that is entirely in "regular" characters. Does the folder/file name contain Unicode characters? Try shortening folder names, or nesting folders less deeply, or using a shorter file name. When your path length is too long, Prism gives a vague message about unable to save file. Windows, even Windows 10, can only handle a path length (folders and file name) of 259 characters. A fix in 7.01 resolves this problem when files created with Prism 6 couldn't be saved from Prism 7.00.
Use Help.Check for updates to update to the latest release. Reboot your computer, as that solves lots of problems. If the problem is that Prism crashes on saving, but Save As works fine, see this faq. We haven't confirmed this, but it is worth a try. Only when all five sections of the navigator were closed (collapsed) would the file save.
One person told us that the file wouldn't save so long as the navigator had any open sections. To do this, go to each table and use File.Export. If that doesn't work, another workaround is to export the each data table to its own text or XML file. When you find and delete the corrupted sheet, the rest of your file should save OK. Then delete that family or just one of its sheets. Once you've found a family containing a corrupted sheet, go to the data table and export the data in TXT or CSV format, so you can import it later. Most likely, you'll be able to save all but one family. This command will save the table you are on as well as all linked sheets. If Prism won't let you save your Prism file, try going to each data table, drop the File menu, choose Save Special, and then choose Save Family as.
How to work around the problem and save your data