If you haven't done this already, remember that when the game updates, it auto-disables custom content and mods. You have to re-enable them yourself. The option to do this is in the menu - go to your game options and click on the "other" tab. There is a box there that says "Enable Custom Content and Mods". Click that, restart your game, and your custom content should reappear.
I have tried everything to get the mods to work in the sims 4 game but if I have even one mod in my file it will not start.
You need to check for updates where you got them.
