I have this issue. I may have had a GeekCon, but didn't attend it. It does work on a different file with less play time, so may not have had the GeekCon event yet on that one, but I'm not sure. I did have a festival to present eggs on the current save, but didn't attend it. The problem happened before that festival. I've had this issue since Cottage Living came out. It happens with and without mods. Here's my latest lastCleanException:
Game Version: 1.77.146.1030 | OS: Windows 10.0.19042 | Created at: 2021-07-28 13:35:16.981947
File "T:\InGame\Gameplay\Scripts\Core\sims4\commands.py", line 398, in invoke_command
File "T:\InGame\Gameplay\Scripts\Server\server_commands\interaction_commands.py", line 663, in generate_choices
File "T:\InGame\Gameplay\Scripts\Server\server_commands\interaction_commands.py", line 656, in _add_potential_object_aops
File "T:\InGame\Gameplay\Scripts\Server\interactions\choices.py", line 110, in add_potential_aops
File "T:\InGame\Gameplay\Scripts\Server\interactions\choices.py", line 194, in add_aop
File "T:\InGame\Gameplay\Scripts\Server\interactions\choices.py", line 164, in is_valid_aop
File "T:\InGame\Gameplay\Scripts\Server\interactions\aop.py", line 166, in test
File "T:\InGame\Gameplay\Scripts\Server\interactions\base\interaction.py", line 2646, in test
Cause: Exception during call to test method on <class 'sims4.tuning.instances.rocketShip_BuildStart'>