Hi — I’m also experiencing the exact same issue: EC:105 on macOS (Sequoia 15.5). From what you described, I believe the code you saw might’ve been a typo — this sounds just like what I’ve been dealing with.
I’ve done a full uninstall/reinstall of the EA App and The Sims 4, cleared all cache, deleted Mods, CC, Tray and Saves, and even tested on a completely fresh macOS user. The EC:105 error still appears every time I try to access the Gallery or even open “My Library,” even in a brand new save with a clean install and no mods.
At this point, it’s clearly not a local problem — it’s something tied to my EA account and cloud-based gallery data.
Here’s my full thread documenting the issue and everything I’ve tried:
👉 [https://forums.ea.com/discussions/ea-app-technical-issues-en/persistent-ec105-gallery-error-—-confirmed-account-based-issue-not-system/12284420](https://forums.ea.com/discussions/ea-app-technical-issues-en/persistent-ec105-gallery-error-—-confirmed-account-based-issue-not-system/12284420)
Let’s stay in touch — if we keep confirming it’s not isolated, hopefully EA will take action. You're definitely not alone in this.