@Lilb6688 Here's what the master post says about this error:
Main Menu and the Gallery showing “wwwwwwwwww” instead of text – causes include outdated Color Sliders (thepancake1 and MizoreYukii), 15 Clubs Per Sim (King Zace), UI Cheats Extension (weerbesu), Better BuildBuy (TwistedMexi), More Columns in CAS (weerbesu), CC wrench icon mods
All of those (except some CC wrench icons) have current working versions. Delete all old versions; check for duplicates. Download and install the new ones. Do go through Broken/Updated Mods & CC as well.
