@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.
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