@kreatora Ok, I've followed all these steps and till point 9 it works and there was not corrupted files with that "X" anymore.
@valearci33This problem may be related to your graphics card. The card cannot read the pictures correctly in the gallery.
It can also be related to damaged files in your game folder.
First, let the game replace the configuration files in the game folder. To do this, you must to do a factory reset of this folder.
Step 1. Rename The Sims4 folder to "The Sims4 old"
Step 2. Fix the game in Origin
Origin/Library - right-click on TS4 - option "Repair game"
You have to wait until Origin will fix all packs, not only the base game.
Step 3. Turn on the game - a new game folder will be created and you will have two - one old, one new
Step 4. Check if you still have this problem in the newly created game folder.
If the problem disappeared
Step 5. Delete in the new game folder following folders:
"saves" and Tray.
Step 6. Go to "The Sims 4 old" folder and copy - your "saves " folder.
From this point, something caused again that "X" in the game, so i think it's the folder "TRAY" where there's my sims saved and infact in the gallery are my sims that are corrupted...
Step. 7, Paste this folder in a newly created game folder.
Step 8. Do the same with Tray folder and TrayDeleteItems file
Step 9. Check if there are newly updated version mods you are using.
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From step 10
the step 10 was not easy for me to understand. Infact, actually I simply copy and paste again the MOD folder with CC inside the mod folder
but i don't think it's a problem inside the mod or cc. It's the sims inside the folder tray that have some files corrupted.. so how i can choose which one is corrupted and deleted it, if I can't identify the exact corrupted families inside the tray folder and deleted them manually from the folder itself... sigh...