Weird object reference error: can anyone assist?

[drew]

I keep getting this error once I unpause my current city:

Simulation error: Object reference not set to an instance of an object
at (wrapper dynamic-method) BuildingAI.BuildingAI.CalculateUnspawnPosition_Patch1 (BuildingAI,uint16,Building&,ColossalFramework.Math.Randomizer&,CitizenInfo,uint16,UnityEngine.Vector3&,UnityEngine.Vector3&,UnityEngine.Vector2&,CitizenInstance/Flags&) <0x00253>
at ResidentAI.StartPathFind (uint16,CitizenInstance&) <0x00949>
at ResidentAI.SetTarget (uint16,CitizenInstance&,uint16,bool) <0x0095c>
at CitizenAI.SetTarget (uint16,CitizenInstance&,uint16) <0x0003e>
at (wrapper dynamic-method) HumanAI.HumanAI.StartMoving_Patch1 (HumanAI,uint,Citizen&,uint16,uint16) <0x0026d>
at (wrapper delegate-invoke) RealTime.GameConnection.HumanAIConnectionBase`2/StartMovingDelegate<ResidentAI, Citizen>.invoke_bool__this___ResidentAI_uint_Citizen&_uint16_uint16 (ResidentAI,uint,Citizen&,uint16,uint16) <0x000af>
at RealTime.CustomAI.RealTimeResidentAI`2<ResidentAI, Citizen>.DoScheduledHome (RealTime.CustomAI.CitizenSchedule&,ResidentAI,uint,Citizen&) <0x000c6>
at RealTime.CustomAI.RealTimeResidentAI`2<ResidentAI, Citizen>.ExecuteCitizenSchedule (RealTime.CustomAI.CitizenSchedule&,ResidentAI,uint,Citizen&,bool) <0x0020d>
at RealTime.CustomAI.RealTimeResidentAI`2<ResidentAI, Citizen>.UpdateLocation (ResidentAI,uint,Citizen&) <0x0035a>
at RealTime.GameConnection.Patches.ResidentAIPatch/ResidentAI_UpdateLocation.Prefix (ResidentAI,uint,Citizen&) <0x0003e>
at (wrapper dynamic-method) ResidentAI.ResidentAI.UpdateLocation_Patch1 (ResidentAI,uint,Citizen&) <0x00049>
at ResidentAI.SimulationStep (uint,Citizen&) <0x00154>
at CitizenManager.SimulationStepImpl (int) <0x00148>
at SimulationManagerBase`2.SimulationStep (int) <0x0004c>
at CitizenManager.ISimulationManager.SimulationStep (int) <0x00024>
at SimulationManager.SimulationStep () <0x00693>
at SimulationManager.SimulationThread () <0x0018a>
[Core]

Any insight on what exactly might be causing the error? I can upload the full log if need be. I can see it has something to do with Real Time generating paths? This'll pop up at odd intervals of 1-15 seconds, so I assume it's popping up every time Real Time wants to generate a new path?

[OverclockedGod]

Same problem here, any help would be appreciated. Even started a new city, after building for 20 mins or so the error returns.

[snowflitzer]

check your list of mods against the broken ones, or the ones we suggested