Error when trying to run training/inference with duplicated environments

Unity Engine
,
1

HI all,

I am getting this error when I try to duplicate DrivingArea3. The area has 4 agents, each with visual observations.

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7434287--910877--upload_2021-8-20_18-4-24.png

NullReferenceException: Object reference not set to an instance of an object
Unity.MLAgents.Sensors.CameraSensor.ObservationToTexture (UnityEngine.Camera obsCamera, UnityEngine.Texture2D texture2D, System.Int32 width, System.Int32 height) (at Library/PackageCache/com.unity.ml-agents@2.1.0-exp.1/Runtime/Sensors/CameraSensor.cs:158)
Unity.MLAgents.Sensors.CameraSensor.GetCompressedObservation () (at Library/PackageCache/com.unity.ml-agents@2.1.0-exp.1/Runtime/Sensors/CameraSensor.cs:92)
Unity.MLAgents.Policies.HeuristicPolicy.StepSensors (System.Collections.Generic.List1[T] sensors) (at Library/PackageCache/com.unity.ml-agents@2.1.0-exp.1/Runtime/Policies/HeuristicPolicy.cs:137)__ __Unity.MLAgents.Policies.HeuristicPolicy.RequestDecision (Unity.MLAgents.AgentInfo info, System.Collections.Generic.List1[T] sensors) (at Library/PackageCache/com.unity.ml-agents@2.1.0-exp.1/Runtime/Policies/HeuristicPolicy.cs:38)
Unity.MLAgents.Agent.SendInfoToBrain () (at Library/PackageCache/com.unity.ml-agents@2.1.0-exp.1/Runtime/Agent.cs:1096)
Unity.MLAgents.Agent.SendInfo () (at Library/PackageCache/com.unity.ml-agents@2.1.0-exp.1/Runtime/Agent.cs:1323)
Unity.MLAgents.Academy.EnvironmentStep () (at Library/PackageCache/com.unity.ml-agents@2.1.0-exp.1/Runtime/Academy.cs:573)
Unity.MLAgents.AcademyFixedUpdateStepper.FixedUpdate () (at Library/PackageCache/com.unity.ml-agents@2.1.0-exp.1/Runtime/Academy.cs:43)

How do I solve this issue?

Ubuntu 18.04
mlagents 2.1.0
Unity 2020.3.11f1

Thanks in advance!

2

oops sorry, problem resolved. Somehow an extra blank Agent script got attached to the agents for some unknown reason. Removed it and its working now.

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