translation 'not found' for pages

Hello, I’ve been having some problems with ceceppa since the last two updating (I’m using 1.0.18 version):
I have to languages on my blog (firts french (fr), and secong portuguese(br))
When on a french page, if I click on the flag to the secong language, I get the message: “Nothing found for 343-autosave”.
That hapens for three of my pages that used to work fine, and that’s the weirdest thing: the other pages continue to works perfectly!

When on the portuguese page,going to the french one always works, so the prblem is just for three of the pages and going from first to second language…
Hope you can help.
thanks

https://www.ads-software.com/extend/plugins/ceceppa-multilingua/