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It's possible you have run out of disk space. Did the error message tell you any details about what went wrong?

Assuming you haven't quit Memento since it happened (in which case you *may* have lost your notes), try making sure you have sufficient disk space on the drive with your 'My Documents' folder on it. You will only need a few hundred at most, usually, for Memento notes.

Then right click the Memento icon and choose 'Save Now'. If you don't see an error message, then the save was successful.

Of course, it stands to reason that you should MAKE REGULAR BACKUPS of data you don't want to lose. If your hard drive dies tomorrow (it's happened to me - twice) then you will lose ALL your data, not just Memento notes! (If in future you want to backup your Memento notes, then they are in the file called 'Memento.notes' in your 'My Documents' folder).

Basically the error means that Memento tried to save your notes to disk, but it could not. The most likely cause for this is lack of disk space. It may have been a temporary problem, and Memento may already have saved the notes to disc since the problem occured.

Also, if you have not upgraded to the latest version (version 1.12) I strongly recommend that you do, especially if you are running version 1.09 or earlier. Again, do this only *after* you have resolved this problem with saving.