Monogame suddenly stopped working.

Ok so i have been working on this character creator for a couple of months now, its a school project so nothing special.
But then suddenly after more then 300h of coding the graphical parts of the program stopped showing.
So it used to look like this.

And now I’m stuck with this:

And i haven’t done anything out of the ordinary in between.

Eddit: There are no error’s what so ever.