Hello! I have the same problem as katy, but the solution isnt working for me. Would you be so kind as to also take a look at my LE, if ofc you want to and have the time.
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<report><version>2</version><sessionid>4a714472a250eab46a3e2dac</sessionid><type>desync</type><sku>ea.maxis.sims4_64.15.pc</sku><createtime>2026-06-26 09:44:33</createtime><buildsignature>Local.Unknown.Unknown.1.124.63.1020-1.300.000.241.Release</buildsignature><categoryid>developmental_milestone_tracker.py:1130</categoryid><desyncid>4a714472a250eab46a3e2dac</desyncid><systemconfig/><screenshot/><desyncdata>Exception raised while processing zone spin up sequence: 'Object not found: 0x319e1eab' (KeyError: 'Object not found: 0x319e1eab') Traceback (most recent call last): File "T:\InGame\Gameplay\Scripts\Core\sims4\utils.py", line 179, in wrapper File "T:\InGame\Gameplay\Scripts\Server\areaserver.py", line 222, in c_api_server_tick File "T:\InGame\Gameplay\Scripts\Server\zone.py", line 512, in update File "T:\InGame\Gameplay\Scripts\Server\zone_spin_up_service.py", line 1881, in update File "T:\InGame\Gameplay\Scripts\Server\zone_spin_up_service.py", line 1513, in on_update File "T:\InGame\Gameplay\Scripts\Server\zone.py", line 741, in on_hit_their_marks File "T:\InGame\Gameplay\Scripts\Server\zone.py", line 1142, in _set_zone_state File "T:\InGame\Gameplay\Scripts\Core\sims4\callback_utils.py", line 158, in __call__ File "T:\InGame\Gameplay\Scripts\Server\developmental_milestones\developmental_milestone_tracker.py", line 1215, in send_all_milestones_update_to_client File "T:\InGame\Gameplay\Scripts\Server\developmental_milestones\developmental_milestone_tracker.py", line 1130, in _get_milestone_update_msg KeyError: 'Object not found: 0x319e1eab'rtim=0 Client Session Time: 20.68 Num Save Errors: 0 Num Load Errors: 0 Current Game State: 0x96d01090 LoadingScreenActiveFlag: 1 Origin Version: 13,735,2,6250 Modded: False SystemInfo: Windows 11 10.0.26200 GPU: NVIDIA GeForce RTX 5070 nvldumdx.dll 32.0.15.9186, GUID: D7B71E3E-6C44-11CF-8859-6B370EC2ED35 </desyncdata></report>
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