Can't Save Trait Conflicts

So, I started learning how to create mods yesterday, I already created some traits and even social interactions. My only problem is my Sim Data files don't save while it saves the Trait Tuning files, when I click save and open the .package again, my Trait Tuning Files are saved, but my Sim Data files are not. If anyone can tell what I'm doing wrong because I'm new to this and still don't have an exact idea of how it works. What I'm trying to do is to add this:

<L name="conflicting_traits">
<T type="TableSetReference">16850</T>
<T type="TableSetReference">27918</T>
</L>

to the Sim Data file,

and this:

<L n="conflicting_traits">
<T>16850</T>
<T>27918</T>
</L>
to the Trait Tuning file.