This problem starts today. Every time i try to open anything on Krita, the software simply close without any warning. Any idea of what is going on?
Yes, what @matt coudert suggests is the wisest solution. What is probably going on is that Krita crashes on opening the canvas, which means there’s something funny going on with your configuration.
If his solution doesn’t work, go to settings → configure Krita → display and untoggle ‘graphics acceleration’ (or change it between opengl and angle). This is usually the cause of crashes when opening/creating a canvas.