[CC and Milestones, error code 110-578ef827] Stuck On Loading Screen Sims 4

Edit: I deleted the Sims 4 folder and started a new game and then it works, but not with my old save file. 3rd gen down the drain or what?😥

Armika74​  Please open Documents > Electronic Arts > The Sims 4 and delete any lastexception files you see.  Try again to load this household, and when it doesn't work, look for a new LE.  If you find one, open it (Notepad is fine), copy the text, and paste it into a reply here.

If you don't see a new LE, that's also useful information.  In that case, let me know whether you can load a previously-unplayed household in that save.

<?xml version="1.0" ?><root>

<report><version>2</version><sessionid>10deee3d09ae9a1a699d4130</sessionid><type>desync</type><sku>ea.maxis.sims4_64.15.pc</sku><createtime>2026-02-24 07:17:21</createtime><buildsignature>Local.Unknown.Unknown.1.121.372.1020-1.300.000.234.Release</buildsignature><categoryid>developmental_milestone_tracker.py:1116</categoryid><desyncid>10deee3d09ae9a1a699d4130</desyncid><systemconfig/><screenshot/><desyncdata>Exception raised while processing zone spin up sequence: 'Object not found: 0xdc0a39a3' (KeyError: 'Object not found: 0xdc0a39a3')&#13;&#10;Traceback (most recent call last):&#13;&#10;&#13;&#10; File "T:\InGame\Gameplay\Scripts\Core\sims4\utils.py", line 179, in wrapper&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\areaserver.py", line 222, in c_api_server_tick&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\sims\masked\v187.16\injector.py", line 26, in _wrapped_function&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\sims\masked\v187.16\zone_tick.py", line 83, in _turbolib_zone_game_update&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\zone.py", line 512, in update&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\zone_spin_up_service.py", line 1881, in update&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\zone_spin_up_service.py", line 1513, in on_update&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\zone.py", line 741, in on_hit_their_marks&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\zone.py", line 1142, in _set_zone_state&#13;&#10; File "T:\InGame\Gameplay\Scripts\Core\sims4\callback_utils.py", line 158, in __call__&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\developmental_milestones\developmental_milestone_tracker.py", line 1211, in send_all_milestones_update_to_client&#13;&#10; File "T:\InGame\Gameplay\Scripts\Server\developmental_milestones\developmental_milestone_tracker.py", line 1116, in _get_milestone_update_msg&#13;&#10;KeyError: 'Object not found: 0xdc0a39a3'rtim=0&#13;&#10;Client Session Time: 43.85&#13; &#10;Num Save Errors: 0&#13; &#10;Num Load Errors: 0&#13; &#10;Current Game State: 0x96d01090&#13; &#10;LoadingScreenActiveFlag: 1&#13; &#10;Origin Version: 13,649,0,6162&#13; &#10;Modded: True&#13; &#10;SystemInfo: Windows 10 10.0.19045 GPU: NVIDIA GeForce GT 730 30.0.14.7514, GUID: C841D1B9-FB98-11EC-9C1F-10604B700981&#13; &#10;</desyncdata></report>

</root>

Armika74​  Please add this mod:

[CC and Milestones, error code 110-578ef827] Stuck On Loading Screen Sims 4 | EA Forums - 9309788

You may be able to remove it after saving with it present, but I've seen mixed reports about that.