It said that when I started playing. I tried the troubleshooting instructions but it still said that.

I'll be a bit more specific and actually help the dev :

Simulation error: Array index is out of range.
at MetroOverhaul.Detours.PassengerTrainAIDetour.StartPathFind (uint16,Vehicle&) <0x004fc>
at PassengerTrainAI.SetTarget (uint16,Vehicle&,uint16) <0x00122>
at DepotAI.ProduceGoods (uint16,Building&,Building/Frame&,int,int,Citizen/BehaviourData&,int,int,int,int,int,int) <0x00827>
at TransportStationAI.ProduceGoods (uint16,Building&,Building/Frame&,int,int,Citizen/BehaviourData&,int,int,int,int,int,int) <0x0008f>
at PlayerBuildingAI.SimulationStepActive (uint16,Building&,Building/Frame&) <0x009cb>
at CommonBuildingAI.SimulationStep (uint16,Building&,Building/Frame&) <0x00e6d>
at PlayerBuildingAI.SimulationStep (uint16,Building&,Building/Frame&) <0x0002f>
at DepotAI.SimulationStep (uint16,Building&,Building/Frame&) <0x0002a>
at TransportStationAI.SimulationStep (uint16,Building&,Building/Frame&) <0x002f8>
at BuildingAI.SimulationStep (uint16,Building&) <0x00060>
at (wrapper dynamic-method) CommonBuildingAI.DMD<DMD<SimulationStep_Patch1>?-514233856..SimulationStep_Patch1> (CommonBuildingAI,uint16,Building&) <0x00071>
at BuildingManager.SimulationStepImpl (int) <0x00675>
at SimulationManagerBase`2.SimulationStep (int) <0x0004c>
at BuildingManager.ISimulationManager.SimulationStep (int) <0x00024>
at SimulationManager.SimulationStep () <0x00693>
at SimulationManager.SimulationThread () <0x0018a>
[Core]

(Filename: C:/buildslave/unity/build/artifacts/generated/common/runtime/DebugBindings.gen.cpp Line: 51)

Also :

Simulation error: Array index is out of range.
at MetroOverhaul.Detours.PassengerTrainAIDetour.ArrivingToDestination (UInt16 vehicleID, .Vehicle& vehicleData) [0x00000] in <filename unknown>:0
at TrainAI.UpdatePathTargetPositions (UInt16 vehicleID, .Vehicle& vehicleData, Vector3 refPos1, Vector3 refPos2, UInt16 leaderID, .Vehicle& leaderData, System.Int32& index, Int32 max1, Int32 max2, Single minSqrDistanceA, Single minSqrDistanceB) [0x00000] in <filename unknown>:0
at TrafficManager.Custom.AI.CustomTrainAI.CustomSimulationStep (UInt16 vehicleId, .Vehicle& vehicleData, .Frame& frameData, UInt16 leaderId, .Vehicle& leaderData, Int32 lodPhysics) [0x00000] in <filename unknown>:0
at PassengerTrainAI.SimulationStep (UInt16 vehicleID, .Vehicle& vehicleData, .Frame& frameData, UInt16 leaderID, .Vehicle& leaderData, Int32 lodPhysics) [0x00000] in <filename unknown>:0
at VehicleAI.SimulationStep (UInt16 vehicleID, .Vehicle& vehicleData, UInt16 leaderID, .Vehicle& leaderData, Int32 lodPhysics) [0x00000] in <filename unknown>:0
at TrafficManager.Custom.AI.CustomTrainAI.CustomSimulationStep (UInt16 vehicleId, .Vehicle& vehicleData, Vector3 physicsLodRefPos) [0x00000] in <filename unknown>:0
at VehicleManager.SimulationStepImpl (Int32 subStep) [0x00000] in <filename unknown>:0
at SimulationManagerBase`2[Manager,Properties].SimulationStep (Int32 subStep) [0x00000] in <filename unknown>:0
at VehicleManager.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]

(Filename: C:/buildslave/unity/build/artifacts/generated/common/runtime/DebugBindings.gen.cpp Line: 51)

And :

Simulation error: Array index is out of range.
at TransportLine.GetPrevSegment (UInt16 stop) [0x00000] in <filename unknown>:0
at TransportLine.CanLeaveStop (UInt16 nextStop, Int32 waitTime) [0x00000] in <filename unknown>:0
at PassengerTrainAI.CanLeave (UInt16 vehicleID, .Vehicle& vehicleData) [0x00000] in <filename unknown>:0
at PassengerTrainAI.SimulationStep (UInt16 vehicleID, .Vehicle& vehicleData, .Frame& frameData, UInt16 leaderID, .Vehicle& leaderData, Int32 lodPhysics) [0x00000] in <filename unknown>:0
at VehicleAI.SimulationStep (UInt16 vehicleID, .Vehicle& vehicleData, UInt16 leaderID, .Vehicle& leaderData, Int32 lodPhysics) [0x00000] in <filename unknown>:0
at TrafficManager.Custom.AI.CustomTrainAI.CustomSimulationStep (UInt16 vehicleId, .Vehicle& vehicleData, Vector3 physicsLodRefPos) [0x00000] in <filename unknown>:0
at VehicleManager.SimulationStepImpl (Int32 subStep) [0x00000] in <filename unknown>:0
at SimulationManagerBase`2[Manager,Properties].SimulationStep (Int32 subStep) [0x00000] in <filename unknown>:0
at VehicleManager.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]

Installing the mod on an already started map

Wdym

I don’t understand you

I'm on a mac

I installed MOM and started playing then it said:
Array index is out of range. [System.IndexOutOfRangeException]

Details:
No details
I’m playing on a MacBook.

I started playing on a already started map

You also may check TMPE's page on github, there is few explainations for simulation errors like this.

wth??? this is mom not tmpe
but i have tmpe too

Make sure you are starting a new game, it wont work on existing saves

oh ok

引用自 Exadius：

Make sure you are starting a new game, it wont work on existing saves

is there a way around this? i have been working on my city for quite some time and would like to utilize this mod without having to start everything over.