Hi.
Did you install the mod correctly?
Can you send a screenshot of the Mods folder?
I would love to send a screenshot of my mods folder... but it won't let me :P. Really, it's just the mods folder from EA on Mac with the resource.cfg and a blue folder titled "WonderfulWhimsv.60-15...347) (2)". Like I said, when I boot up my game, the mods screen shows, but it only shows wonderful whims in the custom content section and not in the script mod section (I don't know if that's how it's supposed to be or not). I. have repeatedly gotten the "fatal error" message and some of the custom content items appear in BB.
Sounds like the mod is installed too many folders deep and the game cannot detect it.
The mod files: Script and Package cannot be located any deeper than /Documents/Electronic Arts/The Sims 4/Mods/folder (for sorting mods for example)/files go here.
Otherwise the game will not find the files.
If this is still unclear you can send me the screenshots through email: