Can't open saved fine

So as if learning this program isn’t enough, not out of the 3 files that are saved one will not open now. I try to open it and it said “Audacity failed to read from a file in C”. What the hell, this is so irritating.

This error message is indicative of a corrupt .aup3 Audacity project file. For help fixing this, see the first post here: Corrupt or Otherwise Broken Audacity Project Recovery