An error on our end caused the launch to fail. Try again a little later.

ladyxixi2000​  You can physically disconnect a cable, turn off wifi, or put the computer in airplane mode (but make sure it's sticking).  The point is not to play without an internet connection indefinitely; this is a test to try to narrow down the source of the issue.  Some problems only happen when a system is connecting to some service, for example the EA App's online features, or OneDrive.

How do you “take your computer into offline mode” really? Turn my internet off my computer because EA is broke!

sabrina1cat111​  I've merged your post with another one about the same error in Sims 3.  Please try the suggestions in my previous post.

When I start the game, it launches then gets stuck on the loading screen and then the EA App displays this message: An error on our end caused the launch to fail the funny part about this is that it was working fine last week and last night and again early this morning but now I try again to play game am the error yes the ea app is update, yes I play with both cc and mods and they are up to date does anybody have an Anwers to help or idea what going on.  

LuuccyyT​  As a test, please try playing in a clean user folder.  Move the entire Sims 3 folder out of Documents > Electronic Arts and onto your desktop.  When you open the Sims 3 launcher, if it opens, a clean folder will spawn with no content.  (Your saves and other content will be intact in the folder you've moved but temporarily unread by the game.)  Don't add anything to the new folder yet; just start a new save and see how it runs.

If you get the same error, try playing with the EA App in offline mode.  If that doesn't help either, leave the App in offline mode and take your computer offline too.