My new lastexception is this. I tried the mod suggested by cdkscully but didn't work for me.
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<report><version>2</version><sessionid>a004708b2316e25f6932cd5a</sessionid><type>desync</type><sku>ea.maxis.sims4.15.macx86</sku><createtime>2025-12-05 13:18:55</createtime><buildsignature>Local.Unknown.Unknown.1.120.117.1230-1.200.000.685.Release</buildsignature><categoryid>developmental_milestone_tracker.py:1116</categoryid><desyncid>a004708b2316e25f6932cd5a</desyncid><systemconfig/><screenshot/><desyncdata>Exception raised while processing zone spin up sequence: 'Object not found: 0x8b28c1ca' (KeyError: 'Object not found: 0x8b28c1ca') 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 1767, in update File "T:\InGame\Gameplay\Scripts\Server\zone_spin_up_service.py", line 1399, 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 1198, in send_all_milestones_update_to_client File "T:\InGame\Gameplay\Scripts\Server\developmental_milestones\developmental_milestone_tracker.py", line 1116, in _get_milestone_update_msg KeyError: 'Object not found: 0x8b28c1ca'rtim=0 Client Session Time: 14.07 Num Save Errors: 0 Num Load Errors: 0 Current Game State: 0x96d01090 LoadingScreenActiveFlag: 1 Origin Version: 13,608,0,6121 Modded: False SystemInfo: Mac OS X Version 12.7.6 (Build 21H1320) GPU: AMD Radeon R9 M370X macOS Metal driver 0.0.0.0 Architecture: x86_64 </desyncdata></report>
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