I have had this issue for a long time now.
The interaction to potty train a toddler will -most of the time- fail if the sim initiation it is not the toddler.
If I have the toddler ask for potty t...
Ideas
I've been having an issue for a while where if my sims (an adult or toddler) try to initiate the potty training action they'll go into a quick t-pose reset and cancel the action from the queue. All animations are typically able to be carried out (sometimes during the talking portion before potty training the toddler and caregiver will stare into space until the action is cancelled), but it's always right before using the toilet that the reset happens. The issue is reported as a constraint issue which could be due to the amount of objects on my lot in my main save file, but the same thing happens in a new save in an unfurnished house. I get this error following a couple of other actions as well, but the potty training one is the only error that happens consistently. I've cleared out any broken or outdated mods I've seen from BE and MCCC reports, but the issue still persists unless I play a reset game with no mods or save files. I don't want to have to build my save completely over again, especially since I've used MCCC to expand the size of my househould and wouldn't be able to save them to gallery for a new save.
Hi Mimo_rock
you say it doesn't happen with no mods/save files. Does it happen with no mods on a new save file and does it happen with a copy of your save with no mods/cc ?
I just tested it to make sure and it worked for a second on a new save file with no mods, but with my past saves and repairing the game before starting. However when I exited and came back the same glitch happened.
Do you still have any LastException files in Documents\Electronic Arts\The Sims 4 ? Please post the ones you get on the vanilla game
- Delete the ones you have
- Trigger the error again
- Check if new ones are created
- If that is the case, please copy/paste the content here. You can open the file with any text editor.
Deleting the file won't fix your issue. Posting the info is meant for troubleshooting.
Here's the LastException file I got:
<?xml version="1.0" ?><root>
<report><version>2</version><sessionid>a47f11f52e141ec869eb74c7</sessionid><type>desync</type><sku>ea.maxis.sims4_64.15.pc</sku><createtime>2026-04-24 09:51:19</createtime><buildsignature>Local.Unknown.Unknown.1.123.66.1030-1.200.000.704.Release</buildsignature><categoryid>constraints.py:1634</categoryid><desyncid>a47f11f52e141ec869eb74c7</desyncid><systemconfig/><screenshot/><desyncdata>Exception in Sim Timeline: Exception running Element (AttributeError: 'Constraint' object has no attribute '_require_carried') Traceback (most recent call last): File "T:\InGame\Gameplay\Scripts\Core\caches.py", line 159, in wrapper KeyError: (ConstraintSet(...), Constraint(...)) During handling of the above exception, another exception occurred: Traceback (most recent call last): File "T:\InGame\Gameplay\Scripts\Core\caches.py", line 159, in wrapper KeyError: (Constraint(...), Constraint(...)) During handling of the above exception, another exception occurred: Traceback (most recent call last): File "T:\InGame\Gameplay\Scripts\Server\scheduling.py", line 231, in simulate File "T:\InGame\Gameplay\Scripts\Server\elements.py", line 335, in _run File "T:\InGame\Gameplay\Scripts\Server\interactions\utils\outcome.py", line 132, in push_continuation File "T:\InGame\Gameplay\Scripts\Server\interactions\base\interaction.py", line 7771, in push_tunable_continuation File "T:\InGame\Gameplay\Scripts\Server\interactions\aop.py", line 243, in test_and_execute File "T:\InGame\Gameplay\Scripts\Server\interactions\aop.py", line 224, in execute File "T:\InGame\Gameplay\Scripts\Server\interactions\aop.py", line 212, in execute_interaction File "T:\InGame\Gameplay\Scripts\Server\interactions\interaction_queue.py", line 1356, in append File "T:\InGame\Gameplay\Scripts\Lib\contextlib.py", line 119, in __exit__ File "T:\InGame\Gameplay\Scripts\Server\interactions\interaction_queue.py", line 901, in _head_change_watcher File "T:\InGame\Gameplay\Scripts\Server\interactions\interaction_queue.py", line 985, in _get_head File "T:\InGame\Gameplay\Scripts\Server\interactions\interaction_queue.py", line 347, in get_next_unblocked_interaction File "T:\InGame\Gameplay\Scripts\Server\interactions\base\super_interaction.py", line 3305, in get_sims_with_invalid_paths File "T:\InGame\Gameplay\Scripts\Server\interactions\base\super_interaction.py", line 3258, in _generate_connectivity File "T:\InGame\Gameplay\Scripts\Server\postures\transition_sequence.py", line 1581, in compute_transition_connectivity File "T:\InGame\Gameplay\Scripts\Server\postures\transition_sequence.py", line 1628, in run_transitions File "T:\InGame\Gameplay\Scripts\Server\postures\transition_sequence.py", line 3600, in _build_transitions File "T:\InGame\Gameplay\Scripts\Server\postures\transition_sequence.py", line 3384, in _build_and_log_transitions_for_sim File "T:\InGame\Gameplay\Scripts\Server\postures\transition_sequence.py", line 3450, in _build_transitions_for_sim File "T:\InGame\Gameplay\Scripts\Server\postures\transition_sequence.py", line 2873, in get_transitions_for_sim File "T:\InGame\Gameplay\Scripts\Server\postures\transition_sequence.py", line 2931, in _get_transitions_for_sim File "T:\InGame\Gameplay\Scripts\Server\postures\transition_sequence.py", line 2296, in _get_constraint_for_interaction File "T:\InGame\Gameplay\Scripts\Server\interactions\base\interaction.py", line 5037, in constraint_intersection File "T:\InGame\Gameplay\Scripts\Core\caches.py", line 169, in wrapper File "interactions\constraints.py", line 1335, in interactions.constraints.Constraint.intersect File "interactions\constraints.py", line 2728, in interactions.constraints._ConstraintSet._intersect File "T:\InGame\Gameplay\Scripts\Core\caches.py", line 169, in wrapper File "interactions\constraints.py", line 1335, in interactions.constraints.Constraint.intersect File "interactions\constraints.py", line 1634, in interactions.constraints.Constraint._intersect File "interactions\constraints.py", line 1588, in interactions.constraints.Constraint._intersect_kwargsAttributeError: 'Constraint' object has no attribute '_require_carried'rtim=0 Client Session Time: 37.81 Num Save Errors: 0 Num Load Errors: 0 Current Game State: 0x96d01090 LoadingScreenActiveFlag: 1 Origin Version: 13,686,0,6199 Modded: False SystemInfo: Windows 11 10.0.26200 GPU: NVIDIA GeForce RTX 4070 Laptop GPU 32.0.15.8195, GUID: 484FA35B-CF13-11EF-A5D0-FDB416041F27 </desyncdata></report>
<report><version>2</version><sessionid>a47f11f52e141ec869eb74c7</sessionid><type>desync</type><sku>ea.maxis.sims4_64.15.pc</sku><createtime>2026-04-24 09:51:19</createtime><buildsignature>Local.Unknown.Unknown.1.123.66.1030-1.200.000.704.Release</buildsignature><categoryid>constraints.py:1588</categoryid><desyncid>a47f11f52e141ec869eb74c7</desyncid><systemconfig/><screenshot/><desyncdata>TODO: Exception thrown during Sim reset, possibly we should be kicking the Sim out of the game. (AttributeError: 'Constraint' object has no attribute '_require_carried') Traceback (most recent call last): File "T:\InGame\Gameplay\Scripts\Server\postures\transition_sequence.py", line 2931, in _get_transitions_for_sim File "T:\InGame\Gameplay\Scripts\Server\postures\transition_sequence.py", line 2296, in _get_constraint_for_interaction File "T:\InGame\Gameplay\Scripts\Server\interactions\base\interaction.py", line 5037, in constraint_intersection File "T:\InGame\Gameplay\Scripts\Core\caches.py", line 169, in wrapper File "T:\InGame\Gameplay\Scripts\Core\caches.py", line 169, in wrapper File "interactions\constraints.py", line 1588, in interactions.constraints.Constraint._intersect_kwargs AttributeError: 'Constraint' object has no attribute '_require_carried'rtim=0 Client Session Time: 37.81 Num Save Errors: 0 Num Load Errors: 0 Current Game State: 0x96d01090 LoadingScreenActiveFlag: 1 Origin Version: 13,686,0,6199 Modded: False SystemInfo: Windows 11 10.0.26200 GPU: NVIDIA GeForce RTX 4070 Laptop GPU 32.0.15.8195, GUID: 484FA35B-CF13-11EF-A5D0-FDB416041F27 </desyncdata></report>
<report><version>2</version><sessionid>a47f11f52e141ec869eb74c7</sessionid><type>desync</type><sku>ea.maxis.sims4_64.15.pc</sku><createtime>2026-04-24 09:51:19</createtime><buildsignature>Local.Unknown.Unknown.1.123.66.1030-1.200.000.704.Release</buildsignature><categoryid>constraints.py:1588</categoryid><desyncid>a47f11f52e141ec869eb74c7</desyncid><systemconfig/><screenshot/><desyncdata>[sscholl] Exception processing ResetRecord:<, reason:ResetReason.RESET_EXPECTED, stage:_Stage.INTERNAL_STATE_RESET, being_processed:True, source:, cause:Work entry resource:WorkEntry( running toddler_MentorSelector_PottyChair:92 on (guaranteed), None, frozenset({<sim '' 0x9b5166ce48c0025>, <sim '' 0x9b5166ce4af002f>}), set(), master_controller, True). This will result in a partially reset object (AttributeError: 'Constraint' object has no attribute '_require_carried') Traceback (most recent call last): File "T:\InGame\Gameplay\Scripts\Server\postures\transition_sequence.py", line 2931, in _get_transitions_for_sim File "T:\InGame\Gameplay\Scripts\Server\postures\transition_sequence.py", line 2296, in _get_constraint_for_interaction File "T:\InGame\Gameplay\Scripts\Server\interactions\base\interaction.py", line 5037, in constraint_intersection File "T:\InGame\Gameplay\Scripts\Core\caches.py", line 169, in wrapper File "T:\InGame\Gameplay\Scripts\Core\caches.py", line 169, in wrapper File "interactions\constraints.py", line 1588, in interactions.constraints.Constraint._intersect_kwargs AttributeError: 'Constraint' object has no attribute '_require_carried'rtim=0 Client Session Time: 37.81 Num Save Errors: 0 Num Load Errors: 0 Current Game State: 0x96d01090 LoadingScreenActiveFlag: 1 Origin Version: 13,686,0,6199 Modded: False SystemInfo: Windows 11 10.0.26200 GPU: NVIDIA GeForce RTX 4070 Laptop GPU 32.0.15.8195, GUID: 484FA35B-CF13-11EF-A5D0-FDB416041F27 </desyncdata></report>
<report><version>2</version><sessionid>a47f11f52e141ec869eb74c7</sessionid><type>desync</type><sku>ea.maxis.sims4_64.15.pc</sku><createtime>2026-04-24 09:51:19</createtime><buildsignature>Local.Unknown.Unknown.1.123.66.1030-1.200.000.704.Release</buildsignature><categoryid>constraints.py:1588</categoryid><desyncid>a47f11f52e141ec869eb74c7</desyncid><systemconfig/><screenshot/><desyncdata>Exception during SI.cancel running sim-stand:94 on None, cancel_reason_msg is Interaction displaced by running sim-stand:98 on None (guaranteed).: (AttributeError: 'Constraint' object has no attribute '_require_carried') Traceback (most recent call last): File "T:\InGame\Gameplay\Scripts\Server\postures\transition_sequence.py", line 2931, in _get_transitions_for_sim File "T:\InGame\Gameplay\Scripts\Server\postures\transition_sequence.py", line 2296, in _get_constraint_for_interaction File "T:\InGame\Gameplay\Scripts\Server\interactions\base\interaction.py", line 5037, in constraint_intersection File "T:\InGame\Gameplay\Scripts\Core\caches.py", line 169, in wrapper File "T:\InGame\Gameplay\Scripts\Core\caches.py", line 169, in wrapper File "interactions\constraints.py", line 1588, in interactions.constraints.Constraint._intersect_kwargs AttributeError: 'Constraint' object has no attribute '_require_carried'rtim=0 Client Session Time: 37.81 Num Save Errors: 0 Num Load Errors: 0 Current Game State: 0x96d01090 LoadingScreenActiveFlag: 1 Origin Version: 13,686,0,6199 Modded: False SystemInfo: Windows 11 10.0.26200 GPU: NVIDIA GeForce RTX 4070 Laptop GPU 32.0.15.8195, GUID: 484FA35B-CF13-11EF-A5D0-FDB416041F27 </desyncdata></report>
</root>
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