[BH] Several classes/lectures don't work

I want to agree with DISL. This issue in particular has been a problem for six months, even though you've had the solution presented to you, you have zero investigation work to do here. Why is this still unresolved?? There hasn't been any communication ever since the issue (and solution) have first been presented. Communication around these issues is abysmal, as is the fact that you keep adding on to problems by releasing new sh*t faster than you solve it and progressingly make your own and your community's lives more miserable because of it.

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.