[BH] Several classes/lectures don't work

List of tunings and what to change, this way it can't get more easy :

si_HobbyClass_StartClass_Fabrication

        <V t="create_situation">
            <U n="create_situation">
                <V n="create_situation" t="situation_start">
                    <U n="situation_start">
                        <V n="actor_init_job" t="specify_job">
                            <T n="specify_job">397235<!--job_HobbyClass_Instructor--></T>
                        </V>
                        <V n="linked_sim_participant" t="enabled" />
                        <T n="situation">398059<!--situation_HobbyClass_Instructor_Fabrication--></T>
                        <V n="situation_default_target" t="enabled" />
                    </U>
                </V>
                <V n="timing" t="at_end">
                    <U n="at_end">
                        <E n="criticality">NotCritical</E>
                    </U>
                </V>
            </U>
        </V>

broadcaster_HobbyClass_Whiteboard_LectureListeners_Fabrication

                <L n="affordances">
                    <U>
                        <T n="affordance">396384<!--sI_HobbyClass_ListenToLecture_Fabrication--></T>
                    </U>
                </L>

broadcaster_HobbyClass_Whiteboard_LectureListeners_ResearchDebate

                <L n="affordances">
                    <U>
                        <T n="affordance">396377<!--sI_HobbyClass_ListenToLecture_ResearchDebate--></T>
                    </U>
                </L>

broadcaster_HobbyClass_Whiteboard_LectureListeners_Robotics

                <L n="affordances">
                    <U>
                        <T n="affordance">396376<!--sI_HobbyClass_ListenToLecture_Robotics--></T>
                    </U>
                </L>

I received a last exception. Here is addtional information:

Issue Description

The whiteboard/lecture system in the Businesses & Hobbies expansion pack is completely broken. When attempting to use whiteboards for hobby classes (specifically Fabrication skill lectures), the system fails with a constant AttributeError loop that generates exceptions every few seconds.

Expected Behavior

• Whiteboards should function properly for hobby classes and workshops
• Sims should be able to attend Fabrication skill lectures
• The sim picker system should correctly identify participating Sims
• Educational businesses using whiteboards should operate normally

Actual Behavior

• Whiteboard lecture system fails immediately when activated
• Constant AttributeError exceptions generated every 2-10 seconds
• Fabrication workshops and hobby classes cannot function
• System creates performance issues due to error spam

Error Evidence

The system fails with the following repeating exception:

<report><version>2</version><sessionid>36e0bc9a80b58ffb690284b1</sessionid><type>desync</type><sku>ea.maxis.sims4_64.15.pc</sku><createtime>2025-10-29 16:17:27</createtime><buildsignature>Local.Unknown.Unknown.1.118.257.1020-1.300.000.223.Release</buildsignature><categoryid>__init__.py:202</categoryid><desyncid>36e0bc9a80b58ffb690284b1</desyncid><systemconfig/><screenshot/><desyncdata>Exception during call to test method on <class 'sims4.tuning.instances.simPicker_HobbyClass_Whiteboard_LectureFor_Fabrication'> (AttributeError: 'SimInfo' object has no attribute 'is_part')
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 530, in update
 File "T:\InGame\Gameplay\Scripts\Server\broadcasters\broadcaster_service.py", line 560, in update
 File "T:\InGame\Gameplay\Scripts\Server\broadcasters\broadcaster_service.py", line 634, in _update
 File "T:\InGame\Gameplay\Scripts\Server\broadcasters\broadcaster.py", line 553, in apply_broadcaster_effect
 File "T:\InGame\Gameplay\Scripts\Server\broadcasters\broadcaster_effect.py", line 104, in apply_broadcaster_effect
 File "T:\InGame\Gameplay\Scripts\Server\broadcasters\broadcaster_effect.py", line 569, in _apply_broadcaster_effect
 File "T:\InGame\Gameplay\Scripts\Server\broadcasters\broadcaster_effect.py", line 555, in _select_and_push_affordance
 File "T:\InGame\Gameplay\Scripts\Server\sims\sim.py", line 4263, in push_super_affordance
 File "T:\InGame\Gameplay\Scripts\Server\interactions\aop.py", line 237, in test_and_execute
 File "T:\InGame\Gameplay\Scripts\Server\interactions\aop.py", line 166, in test
 File "T:\InGame\Gameplay\Scripts\Server\interactions\base\interaction.py", line 3024, in test
 File "T:\InGame\Gameplay\Scripts\Server\event_testing\tests.py", line 782, in run_tests
 File "T:\InGame\Gameplay\Scripts\Server\event_testing\resolver.py", line 147, in __call__
 File "T:\InGame\Gameplay\Scripts\Core\caches.py", line 296, in wrapper
 File "T:\InGame\Gameplay\Scripts\Server\objects\object_tests.py", line 1628, in __call__
 File "T:\InGame\Gameplay\Scripts\Server\objects\components\__init__.py", line 202, in __getattr__
AttributeError: 'SimInfo' object has no attribute 'is_part'rtim=0
Client Session Time: 41.15
 
Num Save Errors: 0
 
Num Load Errors: 0
 
Current Game State: 0x96d01090
 
LoadingScreenActiveFlag: 1
 
Origin Version: 13,579,0,6092
 
Modded: False
 
SystemInfo: Windows 11 10.0.26200 GPU: NVIDIA GeForce RTX 3050 Ti Laptop GPU 32.0.15.7270, GUID: C42BB5F6-9FB4-11EF-984E-B45CECEBCF08
 
</desyncdata></report>

Technical Analysis

The error occurs in this sequence:

1. Broadcaster System activates whiteboard lecture effects
2. Sim Picker (simPicker_HobbyClass_Whiteboard_LectureFor_Fabrication) tries to select participating Sims
3. Object Test attempts to call SimInfo.is_part to check class participation
4. AttributeError: The SimInfo class does not have an is_part attribute/method
5. System Fails: The entire lecture system crashes

Error Frequency

• Constant: Exception occurs every 2-10 seconds
• Persistent: Continues regardless of player actions
• Spammy: Floods lastException files with repeated errors
• Performance Impact: May cause game lag due to constant exception handling

Affected Content

• Businesses & Hobbies Pack: Whiteboard lecture system
• Fabrication Skill: Workshop functionality
• Hobby Classes: Educational business operations
• Skill Progression: Through classroom instruction

Reproduction Steps

1. Own Businesses & Hobbies expansion pack
2. Have a save file with whiteboard usage or educational businesses
3. Wait for game runtime
4. Observe constant AttributeError exceptions in logs

System Information

• Game Version: 1.118.257.1020
• Expansion Pack: Businesses & Hobbies
• Platform: PC
• Modded: No
• OS: Windows 11
• Error ID: simPicker_HobbyClass_Whiteboard_LectureFor_Fabrication

Workaround

Temporarily avoid using whiteboards and pause any educational business operations, though this does not stop the underlying system from attempting to run.

Severity

High - This is a constantly running system failure that affects core pack functionality and creates performance issues through error spam.

Note: This bug appears to be a code compatibility issue where the Businesses & Hobbies pack expects methods that don't exist in the base game or other packs, specifically the missing is_part attribute on SimInfo objects.