Ok so this is driving me insane...
I have been working on my first project for about 3 weeks and today, when I tried to open the project file, this message appeared.
I checked and that "TiledBackground.png" mentioned there it's at its place. I feel like I tried everything and nothing solves this problem.
This is superweird because I have done nothing on my computer that could have affected my project's folder since last time I worked at it.
Anybody have any idea of what might have happened or have I just lost all my work?