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

I have the same issue. I repaired the game and deleted all mods.

I still can't load my last save, where I used mods and cc, because I'm stuck in the loading screen. If I start a new game save or load one where I didn't use mods or cc it works.

This is the LastException I get:

<?xml version="1.0" ?><root>
<report><version>2</version><sessionid>9dbfd14a9d82b3e268a58522</sessionid><type>desync</type><sku>ea.maxis.sims4_64.15.pc</sku><createtime>2025-08-20 10:28:40</createtime><buildsignature>Local.Unknown.Unknown.1.117.227.1030-1.200.000.673.Release</buildsignature><categoryid>developmental_milestone_tracker.py:1114</categoryid><desyncid>9dbfd14a9d82b3e268a58522</desyncid><systemconfig/><screenshot/><desyncdata>Exception raised while processing zone spin up sequence: 'Object not found: 0xcdf3a7ae' (KeyError: 'Object not found: 0xcdf3a7ae')&#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\zone.py", line 512, in update&#13;&#10;  File "T:\InGame\Gameplay\Scripts\Server\zone_spin_up_service.py", line 1757, in update&#13;&#10;  File "T:\InGame\Gameplay\Scripts\Server\zone_spin_up_service.py", line 1389, 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 1206, in send_all_milestones_update_to_client&#13;&#10;  File "T:\InGame\Gameplay\Scripts\Server\developmental_milestones\developmental_milestone_tracker.py", line 1114, in _get_milestone_update_msg&#13;&#10;KeyError: 'Object not found: 0xcdf3a7ae'rtim=0&#13;&#10;Client Session Time: 14.49&#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: 13,531,2,6045&#13; &#10;Modded: False&#13; &#10;SystemInfo: Windows 11 10.0.26100 GPU: AMD Radeon (TM) Graphics  31.0.21910.4002, GUID: 938E692E-BB23-11EF-9688-C2AA948DF198&#13; &#10;</desyncdata></report>
</root>