Problems going into world.

Ive been trying to do mods lately and I'm not too sure if that's the cause of it. Every time I get on my laptop and get on sims. I would create sims or lots, but when I tend to enter the world, it glitches back to the world selections/main menu. It has been doing that for a while. I recently got back on today and it's doing the exact same thing. I'm not sure what to do at this point. I really need answers please.