@BarbaraMdn Just to be clear, there's nothing in your Mods folder except the original, game-generated resource.cfg, and simply checking the box to enable mods in-game produces this error? If that's not correct, please let me know. And if you modified the resource.cfg, or downloaded a different one, please trash the current Mods folder and let the game generate a new one.
Please also let me know what antivirus you use, if any, and whether you've moved Documents or the Sims 4 user folder to a different location than default.
@BarbaraMdn How is the external drive formatted?
Please also try undoing the symbolic link you used to move the Electronic Arts folder. I'm not saying you can't continue to use it, only that this is a useful test.
@BarbaraMdn Before deleting anything, please post screenshots of the contents of the two Sims 4 folders so I can see what's in them. The game itself will generate two folders—one for the program files and one for user data—so the fact that you have two on the external drive doesn't necessarily mean they're redundant.
Please also post the full file path to the user folder Sims 4 is actually reading. Here's how to find it:
https://sims4.crinrict.com/eng/2018/07/how-to-find-your-user-folder/
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