Do you have mods? First off, if you do, remove the Mods folder, then try to open your game again. If that works, then check to make sure your mods are updated. If updated, then move only the ones you absolutely need into the Mods folder and see if the game still opens up. It's a slow process, but I had to do this twice. If things work, then you can add a mod to the folder. Keep this up until you find the game won't open up. Then realize which last mod you placed and tell it goodbye.
If all else fails, do a game repair. I hope this helps. Best of luck.