We fixed some project corruption bugs in r54! Construct 2 is beta software, you should really stay up to date with the latest version!
I'm sorry but there's nothing we can do - we only support bugs in the latest build of Construct 2, because otherwise we can't tell if the problem is already fixed!
I've managed to recover most of your project though - download here, then please upgrade to the latest release right away. The project is mostly intact but I'm afraid the "Bird01", "PathMark" and "Splash_Hit" objects lost their images - these objects are now transparent (no texture).