unable to plan party's /event menu blank

HI so my sims birthday is in 3 days but in the game every time I go to plan a party the event menu is blank and doesn't show up it also doesn't show up for any other date on the calendar that I chose is this because I have custom mods in the game cuz when I turned them off I was able to plan a birthday party after I turned off my mods....Let me know if anyone knows why this happens