Cities: Skylines (Steam) - Simulation error: Object reference not set to an instance of an object

[VMIUJcadet09]

Describe your issue
Simulation error: Object reference not set to an instance of an object

What is your game version?
1.15.1-f4

What expansions do you have installed?
After Dark, Snowfall, Natural Disasters, Mass Transit, Green Cities, Parklife, Industries, Campus, Sunset Harbor, Airports

What mods are you using?
Advanced Building Level Control 1.2
Advanced Stop Selection Revisited 2.0
All Spaces Unlockable
American RoadSigns v2.2.0
Compatibility Report v2.0.5
Find It! 2
Harmony 2.2-0 (Mod Dependency) [Plazas & Promenades compatible]
Less Steam
Loading Screen Mod Revisited 0.8
Move It
Network Anarchy
Ploppable RICO Revisited 2.5
Prop & Tree Anarchy
Prop Snapping
TME 11.7.1.2 STABLE (Traffic Manager: President Edition)
Unlimited Trees Mod v1.12

Please explain your issue is in as much detail as possible.
On some maps/built cities I am getting a simulation error that prevents the city from loading, this error is occurring in 2 of my 6 cities so far, and size of the city file doesn't affect whether I receive the error or not. The simulation error is as follows:

Simulation error: Object reference not set to an instance of an object
at Building.CalculateGroupData (UInt16 buildingID, Int32 layer, System.Int32& vertexCount, System.Int32& triangleCount, System.Int32& objectCount, .VertexArrays& vertexArrays) [0x00000] in <filename unknown>:0
at BuildingManager.CalculateGroupData (Int32 groupX, Int32 groupZ, Int32 layer, System.Int32& vertexCount, System.Int32& triangleCount, System.Int32& objectCount, .VertexArrays& vertexArrays) [0x00000] in <filename unknown>:0
at RenderManager.Managers_CalculateGroupData (Int32 groupX, Int32 groupZ, Int32 layer, System.Int32& vertexCount, System.Int32& triangleCount, System.Int32& objectCount, .VertexArrays& vertexArrays) [0x00000] in <filename unknown>:0
at RenderGroup.UpdateMeshData (.MeshLayer layer, UnityEngine.Vector3& min, UnityEngine.Vector3& max) [0x00000] in <filename unknown>:0
at RenderGroup.UpdateMeshData () [0x00000] in <filename unknown>:0
at RenderManager.SimulationStepImpl (Int32 subStep) [0x00000] in <filename unknown>:0
at SimulationManagerBase`2[Manager,Properties].SimulationStep (Int32 subStep) [0x00000] in <filename unknown>:0
at RenderManager.ISimulationManager.SimulationStep (Int32 subStep) [0x00000] in <filename unknown>:0
at SimulationManager.SimulationStep () [0x00000] in <filename unknown>:0
at SimulationManager.SimulationThread () [0x00000] in <filename unknown>:0 [Core]

Can you replicate the issue? If yes, please explain how you did it.
N/A

Attachments File(s) attached

 

[AndrewT]

Please check your mods against this list:

[Cities Skylines] Broken & Incompatible Mods - Patch 1.16.1-f2

Broken Cities Skylines | List of Broken mods These mods are all broken, dead, or not compatible with the current version of the game. Please read the 'Issue' column before making assumptions! If there is a replacement, it's listed in the green row under Replacement. Links provided for quick uns...

docs.google.com

If you still get this problem after removing or replacing any bad ones, attach here the game's log file:

…\Steam\steamapps\common\CitiesSkylines\CitiesData\output_log.txt

Good luck!

 

[co_avanya]

For a simulation error, I recommend trying to load the city with the Loading Screen Mod's Safe Mode options. To do this go into Options, find the Loading Screen Mod on the list on the left, then find and enable the Safe Mode options. Then try loading your save, if the error is gone, save the city as a new file and disable the Safe Mode options the next time you restart the game.

 

[VMIUJcadet09]

Good Morning @AndrewT and @co_avanya : Thank you so much for your input.

For a simulation error, I recommend trying to load the city with the Loading Screen Mod's Safe Mode options. To do this go into Options, find the Loading Screen Mod on the list on the left, then find and enable the Safe Mode options. Then try loading your save, if the error is gone, save the city as a new file and disable the Safe Mode options the next time you restart the game.

This is what resolved my errors, thank you so much, I really appreciate your support and quick reply!