BUG: Sim is missing all his traits

Problem
When I want to create a Sim in CAS, I can't choose any traits or the lifetime wish. All my already created Sims miss them too.

Cause
This problem is caused by incompatible Mods/Hacks that change anything about the traits (list not conclusive) 

• Hidden Traits unlocked (Treeag - HiddenTraits.package)
• Unlocked Traits for babies and toddlers for predestination (UnlockedTraitsToddlersBabiesjimTNW.package)
• More Children LTR and Traits (JTP_childLTR.package, JTP_childTraits.package, JTP_childLTR_childTraits.package)
• Cooking And Ingredients Overhaul (CookingAndIngredientsOverhaul.package) 

Solution
Remove the mod can clear your cache files.

To restore the traits for existing Sims, use the cheat  testingcheatsenabled true, shift-click on the Sim and choose Add Traits.

Further Reading

• BUG: Missing Traits 
• TUTORIAL: What to do before patching