So, I solved the problem… Since the auto-saved files were “too old” and I’d done a lot of changes after that, I went to temporary files on my computer and opened a newer version. Once I did that, I realized I wasn’t able to save the project, exiting Premiere and open it again. I was thinking about finishing it without exiting Pre but tried to render some minutes to make sure it worked. It didn’t, and the error that Media Enconder detected was something related to the main sequence, it didn’t found it’s the origin. And then, I created a new sequence, copied the data to it and deleted the old one. Why? I still don’t have a clue. I hope this can be useful to somenone.